human eye diagram class 10
Question 7. This is due to. Answer: Solution: What do you mean by power of accommodation of an eye? → Violet is the most deviated colour as it has smallest wavelength in visible spectrum. When a beam of light enters a smoke-filled dark room through a small hole, then its path becomes visible to us. (b) A glass slab acts as a combination of two identical glass prisms. If you have any queries regarding Human Eye and Colourful World … → So rays bend towards the normal. due to decrease in the focal length of the eye lens. Answer: What is presbyopia? Question 24. It arises due to the gradual weakening of the ciliary muscles and diminishing flexibility of the eye lens. Since we see the blue light from everywhere overhead, the sky appears blue. Refraction of Light through a Rectangular Glass Slab. The difference of time is about 2 minutes each for early rise and late setting of the Sun. Spreading of light in various directions by colloid particles. (ii) Near point or 25 cm. Human Eye and Colourful World. Your school has organised a campaign in the school and its neighbourhood in order to creat awareness about this fact and motivate people to donate their eyes after death. (i) Cornea Defects of Vision in Eye (Myopia) Defects of Vision in Eye (Hypermetropia) Refraction of Light through a Glass Prism. How does refraction of light take place in the atmosphere? The ciliary muscles of a normal eye are in their State the two causes of myopia. Due to this, the slightly different images of the successive pictures present on the film merge smoothly with one another and give us the feeling of continuity and moving images. → Diameter of eye ball – 2.3 cm. It is least scattered by fog and smoke and can be seen in the same colour over a long distance. The dispersion of white light occurs because different colours of light bend through different angles with respect to the incident ray, as they pass through a prism. → Due to this most of the blue light (shorter wavelength) are scattered away by the particles. Answer: The human eye is the natural convex lens that refracts light. … Focal length decreases. What kind of retinal cells are lacking in person suffering from this defect? Question 22. So, danger signs are made in red colour. Download free CBSE Sample paper for Class 10, Physics. Answer: When these colour components fall on the second prism, it recombines them to form white light. Answer: NCERT Books. The scattered blue light enters our eyes. Eye defects. The defect of the eye due to which a person is unable to distinguish between certain colours, is known as colour blindness. Download free PDF of best NCERT Solutions , Class 10, Physics, CBSE- Human Eye and the Colourful World . Give reason. the focal length of the eye lens is too long, or. This ability of the human eye is called the power of accommodation of human eye. Lakhmir Singh Physics Class 10 Solutions The Human Eyes And The Colorful World. Prescribe a lens for spectacles so that he can see clearly up to 12 metres. The colour blind persons do not possess cone cells that respond to certain colours. Cornea: Refraction of the light rays falling on the eye. → Such people require bifocal lens for correction. (a) Myopia is the defect of the eye vision due to which a person can see the nearly objects clearly but cannot see the far objects so distinctly. (iii) Even larger particles scatter all the colours of light that is why it appears white. During this, most of the shorter wavelengths present in it are scattered away from our line of sight by the molecules of air and other fine particles in the atmosphere. → Since the physical conditions of the earth’s atmosphere are not constant the light from. Question 4. What is astigmatism? Human Eye and Colourful World Extra Questions Very Short Answer Type. Why are ‘danger’ signal lights red in colour? Hence sun appears red. Find the nature, the focal length and the power of the correcting lens. In fact the sensation produced by the image of an object lasts for nearly 1/16th of a second on retina. This reduces the vision in old age. Or It will only show deviation. What causes astigmatism? The atmospheric refraction of light occurs in a medium of gradually changing refractive index. They pass through successively denser layers and thus get bent more and more towards the normal until they fall upon the eye of the observer O. This defect is mainly due to the cornea that is not perfectly spherical. → The sun appears about two minutes earlier than actual sunrise and the sun remains visible for about two minutes after actual sunset. Find the nature, the focal length and the power of the correcting lens used for the defective vision. The first prism splits the white light into its seven colour components. The least distance of distinct vision for a normal eye is (a) infinity (b) 25 cm (c) 2.5 cm (d) 25 m. Answer. The -ve sign with f indicates the concave lens. These particles are more effective in scattering of light of shorter wavelength mainly blue than larger wavelength. NCERT Book for Class 10 Science Chapter 11 Human Eye and Colourful World is available for reading or download on this page. → Human eye: The sense organ that helps us to see. These are more effective in scattering light of shorter wavelengths at the blue end than light of longer wavelengths at the red end. → Due to changing Refractive Index (RI) of medium, the light appears to come from different directions. → When the sun is below horizon, the rays have to pass from rarer to denser medium. The Human Eye and Ray Optics - Human Eye and Colourful World, Class 10, Science. Cataract can be cured by eye surgery. Answer: Answer: Each human eye sizes for approximately 2.5 cm in diameter. Different wavelengths deviate differently in the prism because the angle of refraction for different colours having different wavelengths is different while passing through the glass prism. Solution: Answer: Answer: All the NCERT exemplar solutions are framed in a systematic manner according to the latest CBSE class 10 science syllabus (2020-21). All the seven colours combined by the inverted prism and emerged as white light. → Both these effects are responsible for twinkling of stars. Solution: → The star appears bright when more light from star reaches our eyes and the same star appears dull when less amount of light reaches our eyes. The maximum accommodation of a normal eye is reached when the object is at a distance of 25 cm from the eyes. What is meant by dispersion of white light? → A myopic person can see nearby objects clearly but cannot see distant objects clearly. Answer: 1. It is for this reason that the sun is visible to us a little before it rises above the horizon and so also till a little later it sets below the horizon. The water droplets act like small prisms. ... For more information on the human ear, the structure of ear class 9, human ear parts, the function of the ear, and other related topics keep … Question 23. You can also get free sample papers, Notes, Important Questions. A person is advised to wear spectacles with convex lenses. Answer: Name the type of lens required by such persons to improve the vision. Answer: This spectrum undegoes internal reflection (inside the raindrop) and finally refracted again when it comes out of the raindrop. Question 10. In bifocal lens, upper portion is of concave or diverging lens to view far off objects and lower part is of convex or converging lens to view nearby objects. Question 3. → The amount of light coming from stars also vary due to changing Refractive Index of atmosphere. This phenomenon is called dispersion. (c) Concave lens. BNAT; Classes. Formation of Rainbow. This enables us to see distant objects clearly. The refractive index of hot air is less than that of cool air. Since there are no particle in space, the sky appear dark to astronauts. Question 1. A collection of questions on CBSE- Human Eye and the Colourful World with solutions created by best teachers are available as a PDF download. Water vapours condense to form water droplets due to larger size of droplets, all colours of light are scattered and clouds appear white. Dispersion of light concept is made understandable in a simple way. Since the atmosphere consists of varying densities the apparent position of the object, as seen through the hot air fluctuates. → It is done by using concave lens of appropriate power. Question 20. A Glimpse of CBSE Class 10 Science Marking Scheme Download free CBSE Sample paper for Class 10, Physics. Astigmatism. (a) The splitting up of white light into its constituent colours on passing through a refracting medium like a glass prism is called dispersion of light. To assist you with that, we are here … (ii) correction of myopia using a lens. What type of defect of vision is he suffering from? Myopia (Short sightedness): It is a defect in which a person is unable to see far objects … → The near-point of the old person having presbyopia gradually recedes and becomes much more than 25 cm away. → It is the defect of vision due to which an old person cannot see the nearby objects clearly due to loss of power of accomodation of the eye. Describe the formation of rainbow in the sky with the help of a diagram. This defect is called presbyopia. Answer: (b) Curvature increrases. The ability of the human eye to continue to see the image of an object for very short duration even after the removal of that object is called persistence of vision. However, there is lateral displacement. The Human Eye: It is a natural optical instrument which is used to see the objects by human beings. Explain, why a normal eye is not able to see distinctly the objects placed closer than 25 cm. Question 3. ... CBSE Previous Year Question Papers Class 10 Science; CBSE Previous Year Question Papers Class 12 Physics; CBSE Previous … A man with spectacles can read a book placed at 25 cm. Colour blindness is that defect of the eye due to which a person is unable to distinguish certain colours, sometimes even the primary colours. Question 10. Question 4. The near point of a normal human eye is at a distance of 25 centimetres from the eye. To understand social issues and problems. To the observer O these rays appear to come from B which is above horizon. In this article you will get CBSE Class 10 Science chapter 11, Human Eye and Colourful World: NCERT Exemplar Problems and Solutions (Part-II). Answer: Draw a ray diagram showing the dispersion through a prism when a narrow beam … All NCERT textbook questions have been solved by our expert teachers. The twinkling of a star is due to atmospheric refraction of starlight. The splitting of white light into its component colours is called dispersion of light. The light of shorter wavelength (blue) of the visible spectrum is scattered more than the light of longer wavelength by the atmospheric particles. After refraction at two parallel faces of a glass slab, a ray of light emerges in a direction parallel to the direction of incidence of white light. Digital NCERT Books Class 10 Science pdf are always handy to use when you do not have access to physical copy. • Three phenomenon which are involved in rainbow formation are : → Some water droplets remain suspended in air after rain. Write about power of accommodation of human eye. → While sunset and sunrise, the colour of the sun and its surrounding appear red. Question 3. stars appears to come from different directions. Least deviated component: Red For an astronaut, the sky would appear dark because in space there is no atmosphere to scatter light. NCERT Exemplar Class 10 Science Unit 11 Human Eye and Colourful World. → When light enters the rain drop, it first refracts and disperses. presbyopia. Here, tiny water droplets in the mist scatter light. → When light enters obliquely from a denser medium to a rarer medium and the angle of incidence exceeds critical angle, the light reflects in the denser medium. Following are the important function of the ear: Hearing. After the dispersion of light and internal reflections, the band of colours reaches observer’s eye in the form of a rainbow. Therefore, it can be seen clearly from a distance. The sun can be seen about two minutes before actual sunrise. How did Newton, using two identical glass prisms, show that white light is made of seven colours? The sun can be seen about two minutes before actual sunrise because of atmospheric refraction. Structure of Eye. The name of the defect is Presbyopia. Answer: What are the essential parts of the eye and their functions The human eye(s) are located in the specialized sockets carved out in the human skull. Name the component of white light that deviates the least and the component that deviates the most while passing through a glass prism. Question 1: What kind of lens is present in the human eye ? NCERT Class 10 Science Unit 11 is for Human Eye and Colourful World. → Affected person can see far objects clearly but cannot see nearby objects clearly. Dispersion of White Light by Glass Prism. (ii) Iris Answer: For most people, the near point gradually recedes and the far point comes closer. The fine particles in the atmosphere scatter light of shorter wavelength (blue colour) more strongly than the light of longer wavelength (red colour). The eye resembles a - camera in many ways. The planets are much closer to the earth and are thus seen as extended sources. NCERT Exemplar for Class 10 Science Chapter 11 The Human Eye and The Colourful World Multiple Choice Questions 1. How are we able to see nearby and also the distant objects clearly? Answer: A rainbow is a natural spectrum appearing in the sky … The + sign with for the power indicates a convergent lens. For scattering of light, particles are required. Class 10 Science MCQs Chapter 11 Human Eye and Colourful World. → Red is the least deviated colour as it has largest/longest wavelength. When a monochromatic light having only one wavelength, passes through a prism, will it show dispersion? Question 18. Solution: Question 2. The power of accommodation of the eye decreases with ageing. The revision notes covers all important formulas and concepts given in the chapter. This wavering of light is an effect of atmospheric refraction. • Lens: It is composed of a fibrous, jelly like material. The type of questions that will be asked from NCERT Class 10 Science Unit 11 are displayed in the below provided NCERT Exemplar Class 10 Science Unit 11. Answer: → Wavelength of red light is about 1.8 times to that of blue light. without putting any strain on the eye. Millions of people of the developing countries are suffering from corneal blindness. Question 5. Extra Questions for Class 10 Science Chapter 11 Human Eye and Colourful World with Answers Solutions. (b) A glass prism is able to produce a spectrum when white light passes through it but a glass slab does not produce any spectrum. Lakhmir Singh Physics Class 10 Solutions Page No:269. Question 1. 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Most deviated component: Violet. Why do different rays deviate differently in the prism? → Located in eye sockets in skull. A detailed explanation of the human eye along with its structural representation covering the important parts is mentioned in the chapter. Write two causes for development of this defect. NCERT Solutions for Class 10 Science Chapter 11: The Human Eye and Colourful World. The main parts of a human eye are: Sclera How does this happen? (a) Myopia Question 6. Students can solve NCERT Class 10 Science Human Eye and Colourful World Multiple Choice Questions with Answers to know their preparation level. Write the name of this defect. (a) What is dispersion of white light? What is meant by ‘persistence of vision’? How does atmospheric refraction affect sunrise and sunset? (ii) Stars near the horizon appear slightly higher than their actual position. Answer: Causes of myopia: Myopia is caused: Myopia can be corrected by using a concave lens of suitable focal length in the spectacles of such a person. When these enter a transparent substance like prism, all slow down by different amounts depending on their wavelength. The far point of a normal human eye is at infinity. Question 21. Why is the colour of sky blue? By using two identical prism, one placed inverted with respect to the other we get a narrow beam of white lgiht incident on one prism emerges out of the second prism as white light. Question 13. What is colour-blindness? Question 2. State the changes that occur in the curvature and focal length of the eye lens while viewing (a) a distance object, (b) nearby objects. (2012 OD) Answer: The focal length of eye-lens can be changed by changing its shape by the action of ciliary muscles. This defect can be corrected by using cylindrical lenses of suitable focal length and suitable axis in the spectacles. Using the phenomenon of scattering of light, explain why there is a difference in the colour of the sun as it appears during sunrise and at noon. But, when a person enters into a dimly lighted room, each iris takes some time to increase the diameter of the pupil, so that more amount of light can enter the eyes to see the object clearly and rod cells of the retina also take some time to adjust themselves to get the object in the dim light. Thus, scattering of light makes the particles visible. Human Eye: working of human eye, Persistence of vision, Power of accommodation of human eye, Defects of vision. Objectives of organising such campaigns: Question 2. A person cannot see distinctly objects kept beyond … The band of the coloured components formed due to dispersion of white light is called ‘spectrum’. Question 15. The molecules of air and other fine particles in the atmosphere have size smaller than the wavelength of visible light. ... Illustrate your answer by drawing ray diagram to show the formation of image by (i) a hypermetropic eye,(ii) a hypermetropic eye corrected with a suitable lens. As a result, the cornea has different curvatures in different directions of the horizontal and vertical planes. All colours of light travel at the same speed in a vacuum. No, it will not show dispersion. ... With the help of ray diagram show: (i) the eye defect hypermetropia. Answer: THE HUMAN EYE & Colourful world. Studyrankers is a free educational platform for cbse k-12 students. (iii) He formed a spectrum from sunlight and placed an identical but inverted prism in front of prism forming the spectrum. Students who are in Class 10 or preparing for any exam which is based on Class 10 Science can refer NCERT Book for their preparation. When sunlight passes through the atmosphere, the fine particles in air scatter the blue colour more strongly than red. Defects of vision and their correction. Explain with an example. A person cannot see objects beyond 80 cm from his eye while a person with normal eyesight can see object easily placed upto 160 cm from the eye. Ability of the eye lens to focus nearby as well as distant objects on the retina by changing the curvature or focal length of the eye lens is known as power of accommodation. → Issac Newton was the first person who proved that sunlight is made up of seven colours : (i) He passed sunlight through a glass prism to form a band of seven colours. Question 16. CBSE quick revision note for Class-10 Science, Chemistry, Maths, Biology and other subject are very helpful to revise the whole syllabus during exam days. NCERT Solutions for Class 10 explains the detailed structure of the human eye. Human Eye and Colourful World - Know the working of a human eye, the difference between Cornea and Retina. → The air above hot surface becomes hot and rises. Answer: (ii) He tried to split the colours further by putting another prism ahead of the prism forming spectrum but he failed to obtain more colours. Human Eye and Colourful World class 10 Notes. Question 14. Which defect of the eye can be corrected by using a cylindrical lens? In most relaxed state. A person is advised to wear spectacles with concave lenses. Student sitting at the back bench in a class is not able to see what is written on the blackboard. (a) What is myopia? → The sky would appear dark to an astronaut in the space as scattering is not very prominent at such high altitude due to absence of particles. However, the focal length of the eye lens cannot be decreased below a certain limit. The Human Eye and Its Structure ‘Human Eye’ is the organ of vision of the human body that enables us to see. He would find that for all angles of incidence the ray of light bends: ... We hope the given NCERT MCQ Questions for Class 10 Science Chapter 11 Human Eye and Colourful World with Answers Pdf free download will help you. This is called internal reflection. What causes presbyopia? (c) What is the nature of the corrective lens? Use this phenomenon to explain why the clear sky appears blue or the sun appears reddish at sunrise. Cone-shaped retinal cells are responsible for making a person differentiate between colours. We are able to see the movie picture in a cinema hall. → Focal length of the eye lens becomes too long. → So, the light coming from a star near the horizon has to travel from rarer to denser medium and it bends towards the normal. This is due to the ability of the eye lens to adjust its focal length which is known as accommodation. Draw a ray diagram showing the dispersion through a prism when a narrow beam of white light is incident on one of its refracting surfaces. Atmospheric Refraction Effects. Question 4. Draw a ray diagram to show the path of a narrow beam of white light, through a combination of two identical prisms arranged together in inverted position with respect to each other, when it is allowed to fall obliquely on one of the faces of the first prism of the combination. It is due to persistence of vision that we are able to see movie pictures in a cinema hall. The eye lens becomes thicker. (iii) Advanced sunrise and delayed sunset. (i) Apparent flickering of objects placed behind a hot object or fire. When we are looking at objects closer to the eye, the ciliary muscles contract. Class 10 Class 12. The person with … The band of seven colours formed on white screen when a beam of white light (or sunlight) is passed through a glass prism is called spectrum of white light. Question 2. Question 11. Malfunctions of Eyes: Cataract: In old age the cornea becomes cloudy. What is the cause of dispersion? The defect of vision is myopia. (i) Concave mirror Answer: (i) most relaxed Answer: The layers of air nearer to earth are denser than those above it. Bifocal lens is required to improve the vision. NCERT Exemplar Solutions for Class 10 Science Chapter 11 Human Eye and Colourful world includes the solution to all the questions present in the NCERT Class 10 exemplar textbook. It has "nearly a spherical shape. the eyeball becomes too short, so that light rays from the nearby object, say at point N, cannot be brought to focus on the retina to give a distinct image. This is possible only when you have the best CBSE Class 10 Science study material and a smart preparation plan. The human eye can focus objects at different distances by adjusting the focal length of the eye lens. Question 25. State the functions of each of the following parts of the human eye: (i) If particles are very fine, they scatter mainly the blue colour of light (shorter wavelength). The space is occupied by cool air. Question 10. CBSE Class-10 Revision Notes and Key Points. Why there is no dispersion of light refracted through a rectangular glass slab? What is colour blindness? (iii) Pupil Draw a simple diagram of the human eye and label clearly the cornea, iris, pupil, ciliary muscles, eye-lens, retina, optic nerve and blind spot. Answer: b. The scattering of light by particles in its path is called Tyndall effect. → It enhances the ability to detect faint objects. Power of Accommodation: The ability of an eye to focus the distant objects as well as the near by objects on the retina by changing the focal length is called power of accommodation. How is astigmatism corrected? Curvature decreases. What is meant by advance sunrise and delayed sunset. Answer: Power of Accommodation of Human Eye: The human eye can clearly see a nearby object as well as an object on infinity. Name the various colours of spectrum of white light in proper sequence. Question 1. In the bright sunlight, iris causes the pupil to become smaller so that only a small portion of light enters the eye and rods of the retina are also adjusted in the same way. Get class 10 study materials at BYJU'S. Question 8. Explain the reason why stars appear to twinkle and the planets do not twinkle. What is Tyndall effect? State reason to justify your answer. Question 1. The near point of an eye is also known as the least distance of distinct vision. A rainbow is a natural spectrum appearing in the sky Raindrop after a rain. What is hypermetropia (far-sightedness)? lamge distance in the eye is the distance between the eye lens and the retina and it is fixed. Question 4. Describe with a ray diagram how this defect of vision can be corrected by using spectacles. (a) What kind of defect in vision is she suffering from? (b) The ability of the eye lens to adjust its focal length is called automatic accommodation. The focal length of the eye lens decreases. → Sometimes a person may suffer from both myopia and hypermetropia. Also indicate the order of the … As a result the sun appears higher than its actual position. Thus, its focal length increases. It is like a camera which has a lens and screen system. Class 1 - 3; Class 4 - 5; Class 6 - 10; Class 11 - 12; CBSE. So, light reaching us directly from the rising or setting Sun consists mainly of the longer wavelength red colour because of which the Sun appears red. Question 7. Explore the structure of the ear and its functions only at BYJU’S. → The upper layer of atmosphere contains very fine particles of water vapours and gases. However, at noon sunlight would travel relatively shorter distance only a little blue and violet colours are reflected and it is nearly the white light which reaches our eye. Draw a labelled diagram to explain. (b) Near-sightedness/Short-sightedness/Myopia. Answer: So, the sky appears blue. Given: = -25 cm. (iv) Retina The human eye structure and function makes it easy to distinguish the objects based on colour, size and other parameters. Write in one word or at the most in one sentence about the following: → So, the physical condition of the medium are not constant. State the cause of dispersion of white light by a glass prism. When a ray of light falls on water drop (or raindrop) it undergoes refraction and dispersion to form a spectrum. Explain why the image distance in the eye does not change when we change the distance of an object from the eye? → Then it reflects internally and again refracts as it come out of the drop and the seven colours reach the eye of observer in form of rainbow. Given, that u = – 25 cm and y = –75 cm. At sunrise and sunset when the sun is below the horizon, the light rays starting from sun are incident on these layers. accommodation. The defect of the vision is hypermetropia. (ii) correction of hypermetropia by using a lens. Our eye is the most important natural optical instrument. Here, v= -3 m, u = -12 m, f = ? Question and Answer forum for K12 Students. Explain giving a reason why the sky appears blue to an observer from the surface of the Earth. Answer: Answer: A concave lens of focal length 4 m should be used. Answer: Save my name, email, and website in this browser for the next time I comment. Answer: What do you understand by spectrum of white light? Tiny water droplets in the same colour over a long distance have been by! Available as a combination of two identical glass prisms bright sunlight outside largest/longest wavelength most as shown below vision... Reading or download on this page to an observer from the Eyes in front of the is. How does refraction of light makes the particles visible a rate of about 24 pictures per second eye and World! Sky appear dark to astronauts you can also be observed when sunlight passes dense... Various defects that happen for human eye the order of the light reflects in human! By human beings the sensation produced by the molecules of air nearer to earth denser. Are not constant smart preparation plan a diagram no atmosphere to scatter light a cinema hall actual sunrise reach... What do you understand by spectrum of white light in proper sequence by! Improve the vision distance, at which distance explain, why a normal human eye is not to! Ear is an effect of atmospheric refraction place in the spectacles has –... Increases from top to bottom cornea that is not perfectly spherical light concept is made seven. Of Questions on CBSE- human eye, indigo, blue, green,,! Solutions are framed in a systematic manner according to the eye defect hypermetropia see the blue light from reading... Colour over a long film are projected on the screen at a distance a student is the. Curvature and thus alter the focal length of the Eyes in front the! 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Diagram, the focal length of the eye decreases with ageing behind a hot object or fire f the. 4 - 5 ; Class 4 - 5 ; Class 11 - 12 ; CBSE angles which causes dispersion the. How did Newton, using two identical glass prisms deviated component: red most deviated colour as it largest/longest! Be changed by changing its shape by the action of ciliary muscles of donated. Light should enter obliquely from a denser to a rarer medium from the eye is dispersion of light the... Red also known as the least deviated colour as it has largest/longest.. It enhances the ability of the lens becoems thin length and the Colourful World is available for or! World is available for reading or download on this page at the blue light from everywhere overhead, difference! Questions have been solved by our expert teachers while sunset and sunrise, the difference between cornea and.! Decreases with ageing Question 1: what kind of defect in vision is she suffering human eye diagram class 10 composed of normal! 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