This is called internal reflection. The ciliary muscles of a normal eye are in their What type of defect of vision is he suffering from? Formation of Rainbow. The human eye structure and function makes it easy to distinguish the objects based on colour, size and other parameters. Answer: Near point or Least distance of distinct vision, Advantage of the eyes in front of the face. Question 23. Tyndall effect can also be observed when sunlight passes through a canopy of a dense forest. (iii) Advanced sunrise and delayed sunset. Why do different rays deviate differently in the prism? → So, the light coming from a star near the horizon has to travel from rarer to denser medium and it bends towards the normal. (ii) Path of light becomes visible when light passes through dense canopy of trees in a forest. THE HUMAN EYE & Colourful world. The Human Eye and Its Structure ‘Human Eye’ is the organ of vision of the human body that enables us to see. This is possible only when you have the best CBSE Class 10 Science study material and a smart preparation plan. Or What type of defect of vision is he suffering from? This enables us to see distant objects clearly. → Red is the least deviated colour as it has largest/longest wavelength. Here, v= -3 m, u = -12 m, f = ? Write two causes for development of this defect. What do you mean by power of accommodation of an eye? Question 22. → The near-point of the old person having presbyopia gradually recedes and becomes much more than 25 cm away. What is presbyopia? The Human Eye and Ray Optics - Human Eye and Colourful World, Class 10, Science. Function of Ear. → Sometimes a person may suffer from both myopia and hypermetropia. Answer: Since we see the blue light from everywhere overhead, the sky appears blue. The main parts of a human eye are: Sclera Students can solve NCERT Class 10 Science Human Eye and Colourful World Multiple Choice Questions with Answers to know their preparation level. The light of longer wavelength (red colour) will reach our eye. To understand social issues and problems. Human Eye: working of human eye, Persistence of vision, Power of accommodation of human eye, Defects of vision. → Due to this most of the blue light (shorter wavelength) are scattered away by the particles. Question 1. Spreading of light in various directions by colloid particles. Question 2. → Located in eye sockets in skull. As a result the sun appears higher than its actual position. → Use of convex lens of suitable power can correct the defect. Describe with a ray diagram how this defect of vision can be … Answer: The defect of the eye due to which a person is unable to distinguish between certain colours, is known as colour blindness. A planet is considered as a collection of large number of point sized sources of light, the total variation in the amount of light entering our eye from all individual point sized sources will average out to zero, thereby nullifying the twinkling effect. NCERT Books. What causes presbyopia? BNAT; Classes. Lakhmir Singh Physics Class 10 Solutions The Human Eyes And The Colorful World. → Clouds are formed by water vapours. → The angle of incidence should exceed critical angle, the light reflects in the denser medium. 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. → Affected person can see far objects clearly but cannot see nearby objects clearly. (CBSE 2009) Answer: (a) Hypermetropia: It is also called long-sightedness. The name of the defect is Presbyopia. The scattering of light by particles in its path is called Tyndall effect. (i) If particles are very fine, they scatter mainly the blue colour of light (shorter wavelength). NCERT Book for Class 10 Science Chapter 11 Human Eye and Colourful World is available for reading or download on this page. NCERT Class 10 Science Unit 11 is for Human Eye and Colourful World. (i) Apparent flickering of objects placed behind a hot object or fire. It is due to persistence of vision that we are able to see movie pictures in a cinema hall. • Three phenomenon which are involved in rainbow formation are : → Some water droplets remain suspended in air after rain. To the observer O these rays appear to come from B which is above horizon. It arises due to the gradual weakening of the ciliary muscles and diminishing flexibility of the eye lens. 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. As the object approaches from infinity towards the eye, the focal length of the eye lens decreases (or vice-versa) so as to maintain the same image distance. Answer: All NCERT textbook questions have been solved by our expert teachers. Therefore, it can be seen clearly from a distance. 2. The planets are much closer to the earth and are thus seen as extended sources. When sunlight passes through the atmosphere, the fine particles in air scatter the blue colour more strongly than red. → 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. A collection of questions on CBSE- Human Eye and the Colourful World with solutions created by best teachers are available as a PDF … A detailed explanation of the human eye along with its structural representation covering the important parts is mentioned in the chapter. Class 10 Science MCQs Chapter 11 Human Eye and Colourful World. As a result, the cornea has different curvatures in different directions of the horizontal and vertical planes. 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. Answer: (2012 OD) Answer: The focal length of eye-lens can be changed by changing its shape by the action of ciliary muscles. Hence shorter waves are scattered .. away and longer (red) waves reach our eye. The band of the coloured components formed due to dispersion of white light is called ‘spectrum’. Answer: The maximum accommodation of a normal eye is reached when the object is at a distance of 25 cm from the eyes. Question 4. The second prism can be considered to be placed in an inverted position with respect to the first. 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. Question 10. → 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. State the two causes of myopia. When we are looking at objects closer to the eye, the ciliary muscles contract. Human Eye and Colourful World - Know the working of a human eye, the difference between Cornea and Retina. A rainbow is a natural spectrum appearing in the sky Raindrop after a rain. All the seven colours combined by the inverted prism and emerged as white light. It is also called eyesight. CBSE Class-10 Revision Notes and Key Points. (a) What is myopia? (ii) Iris The red light bends the least while the violet the most as shown below. What is hypermetropia (far-sightedness)? Hence sun appears red. 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. What is meant by dispersion of white light? Human Eye and Colourful World. ... With the help of ray diagram show: (i) the eye defect hypermetropia. So, the sky appears blue. Question 18. Answer: Download free PDF of best NCERT Solutions , Class 10, Physics, CBSE- Human Eye and the Colourful World . The molecules of air and other fine particles in the atmosphere have size smaller than the wavelength of visible light. In most relaxed state. Focal length decreases. (ii) correction of myopia using a lens. This phenomenon is called dispersion. The nearest point up to which the eye can see an object clearly without any strain, is called the near point of the eye. Find the nature, the focal length and the power of the correcting lens. Curvature decreases. (i) most relaxed Use this phenomenon to explain why the clear sky appears blue or the sun appears reddish at sunrise. NCERT Solutions for Class 10 Science Chapter 11: The Human Eye and Colourful World. This increases the curvature of the eye lens. State the functions of each of the following parts of the human eye: 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. Answer: The + sign with for the power indicates a convergent lens. Prescribe a lens for spectacles so that he can see clearly up to 12 metres. Following are the important function of the ear: Hearing. Answer: b. Solution: → Light should enter obliquely from a denser to a rarer medium. Question 5. → It results in fluctuation in apparent position of object. All the NCERT exemplar solutions are framed in a systematic manner according to the latest CBSE class 10 science syllabus (2020-21). The sun can be seen about two minutes before actual sunrise. Answer: Why there is no dispersion of light refracted through a rectangular glass slab? This disease can be cured by replacing the defective cornea with the cornea of a donated eye. The water droplets act like small prisms. Human Eye and Colourful World Class 10 Important Questions Short Answer Type I. To assist you with that, we are here … (ii) The smallest distance, at which the eye can see objects clearly without strain. Digital NCERT Books Class 10 Science pdf are always handy to use when you do not have access to physical copy. The colour blind persons do not possess cone cells that respond to certain colours. The human ear is an important organ of the human body responsible for hearing and balance. (i) Cornea 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. Such a person may suffer from myopia and hypermetropia. A person is advised to wear spectacles with concave lenses. The person with … Lakhmir Singh Physics Class 10 Solutions Page No:269. Draw a ray diagram showing the dispersion through a prism when a narrow beam … As rays of all colours emerge in the same direction, i.e., the direction of the incidence of white light, there is no dispersion. The near point of a normal human eye is at a distance of 25 centimetres from the eye. BOOK FREE CLASS; COMPETITIVE EXAMS. Answer: Answer: This is due to the ability of the eye lens to adjust its focal length which is known as accommodation. Human Eye and Colourful world Class 10 Important Questions with Answers Science Chapter 11 Human Eye and Colourful world Class 10 Important Questions Short Answer Type. Answer: A Glimpse of CBSE Class 10 Science Marking Scheme Answer: Question 6. → The refractive index of earth’s atmosphere in general increases from top to bottom. State reason to justify your answer. Find the nature, the focal length and the power of the correcting lens used for the defective vision. 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. → It enhances the ability to detect faint objects. 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. The layers of air nearer to earth are denser than those above it. Most deviated component: Violet. (a) Myopia Bifocal lens is required to improve the vision. State the cause of dispersion of white light by a glass prism. Colour blindness is that defect of the eye due to which a person is unable to distinguish certain colours, sometimes even the primary colours. Thus, scattering of light makes the particles visible. → Human eye: The sense organ that helps us to see. This wavering of light is an effect of atmospheric refraction. ... 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. Question 15. (iii) He formed a spectrum from sunlight and placed an identical but inverted prism in front of prism forming the spectrum. The sun can be seen about two minutes before actual sunrise because of atmospheric refraction. 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. Answer: Explore the structure of the ear and its functions only at BYJU’S. Zigya App (a) What is hypermetropia? Question 13. → Such people require bifocal lens for correction. Answer: We can contribute by participating in different ways of motivating people for the noble cause of eye donation such as, street play, banners, poster, door to door campaign, etc. Thus, its focal length increases. The tiny dust particles present in the air of room scatter the beam of light all around the room. This defect is called presbyopia. Question 3. This defect is then corrected by using bi-focal lenses of suitable focal lengths. This reduces the vision in old age. A student is observing the diagram showing the path of a ray of light passing through a glass prism. A concave lens of focal length 4 m should be used. What is meant by advance sunrise and delayed sunset. The human eye(s) are located in the specialized sockets carved out in the human skull. So, it is important to know the defects of vision and which type of lens can cure which defect. → Due to changing Refractive Index (RI) of medium, the light appears to come from different directions. Image Formation by Concave Mirror. In this article you will get CBSE Class 10 Science chapter 11, Human Eye and Colourful World: NCERT Exemplar Problems and Solutions (Part-II). → Since the physical conditions of the earth’s atmosphere are not constant the light from. This defect of the eye is hypermetropia. Class 1 - 3; Class 4 - 5; Class 6 - 10; Class 11 - 12; CBSE. Question 2. These particles are more effective in scattering of light of shorter wavelength mainly blue than larger wavelength. A rainbow is always formed in the direction opposite to that of the sun. Cornea: Refraction of the light rays falling on the eye. Given: = -25 cm. → While sunset and sunrise, the colour of the sun and its surrounding appear red. This defect is mainly due to the cornea that is not perfectly spherical. Question 3. 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. Solution : Convex lens. → It is done by using concave lens of appropriate power. A collection of questions on CBSE- Human Eye and the Colourful World with solutions created by best teachers are available as a PDF download. No, it will not show dispersion. How will you use two identical prisms so that a narrow beam of white light incident on one prism emerges out of the second prism as white light? Name the type of lens required by such persons to improve the vision. Astigmatism. Focal length increases. When these colour components fall on the second prism, it recombines them to form white light. → Red is the least scattered colour. → Both these effects are responsible for twinkling of stars. What should the appearance of the sky be during the day for an astronaut staying in the international space station orbiting the Earth? A person can see clearly only up to 3 metres. Malfunctions of Eyes: Cataract: In old age the cornea becomes cloudy. Myopia (Short sightedness): It is a defect in which a person is unable to see far objects … With the help of labelled ray diagrams show With the help of ciliary muscles the human eye can change its curvature and thus alter the focal length of its lens. The defect of vision is myopia. (c) What is the nature of the corrective lens? Describe with a ray diagram how this defect of vision can be corrected by using spectacles. Why are ‘danger’ signal lights red in colour? (b) Curvature increrases. (ii) correction of hypermetropia by using a lens. Solution: Question 8. Answer: The human eye is the natural convex lens that refracts light. In this page, you can find CBSE Class 10 Science Chapter 11 Extra Questions and Answers Human Eye and Colourful World Pdf free download, NCERT Extra Questions for Class 10 Science will make your practice complete. Power of Accommodation of Human Eye: The human eye can clearly see a nearby object as well as an object on infinity. Solution: Question 21. Question 25. Get class 10 study materials at BYJU'S. At the time of sunrise and sunset, when the Sun is near the horizon, sunlight travels a greater distance through the atmosphere to reach us. Why does it take some time to see objects in a dim room when you enter the room from bright sunlight outside? Question 1. The fine particles in the atmosphere scatter light of shorter wavelength (blue colour) more strongly than the light of longer wavelength (red colour). (i) the eye defect myopia Answer: Give reason. State its cause. Question 9. 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. Danger signal lights are red in colour because the red coloured light having longer wavelength is scattered the least by fog or smoke. CBSE Previous Year Question Paper for Class 10, CBSE Previous Year Question Paper for Class 12. 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. Download free CBSE Sample paper for Class 10, Physics. Question 3. Water vapours condense to form water droplets due to larger size of droplets, all colours of light are scattered and clouds appear white. → 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. Question 4. Explain the reason why stars appear to twinkle and the planets do not twinkle. In which of the two cases is the focal length of the eye-lens more? Answer: State one role of ciliary muscles in the human eye. (ii) Near point or 25 cm. → The amount of light coming from stars also vary due to changing Refractive Index of atmosphere. Objectives of organising such campaigns: Question 2. It is produced by dispersion of sunlight by tiny water droplets, present in the atmosphere. How are we able to see nearby and also the distant objects clearly? Defects of vision and their correction. During sunset and sunrise, the sun is near horizon and therefore the sunlight has to travel larger distance in atmosphere. This defect can be corrected by using cylindrical lenses of suitable focal length and suitable axis in the spectacles. Question 7. Dispersion of White Light by Glass Prism. (b)Why is the normal eye unable to focus on an object placed within 10 cm from the eye? However, the focal length of the eye lens cannot be decreased below a certain limit. This is why sun appear red in colour. 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. → Focal length of the eye lens becomes too long. At sunrise, light from the sun near the horizon passes through thicker layers of air and larger distance in the earth’s atmosphere before reaching our eye. The twinkling of a star is due to atmospheric refraction of starlight. The pictures in the form of a long film are projected on the screen at a rate of about 24 pictures per second. (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. This is due to. The power of accommodation of the eye decreases with ageing. (ii) most contracted state. Question 7. Why is the colour of sky blue? Seven colours of spectrum are violet, indigo, blue, green, yellow, orange and red also known as ‘VIBGYOR’. 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. Answer: Pupil: To regulate and control the amount of light entering the eye. The least distance of distinct vision for a normal eye is (a) infinity (b) 25 cm (c) 2.5 cm (d) 25 m. Answer. What is Tyndall effect? → Stars are very far from us, so they behave as point source of light. Here, tiny water droplets in the mist scatter light. Science NCERT Grade 10, Chapter 11, Human Eye and Colourful World lays emphasis on the understanding of the working of the human eye along with the functions of different parts of the human eye. The Human Eye: It is a natural optical instrument which is used to see the objects by human beings. Thus, the normal eye is unable to focus an object placed within 10 cm from the eye because it is beyond its power of accommodation. Name the various colours of spectrum of white light in proper sequence. Answer: Answer: Which defect of the eye can be corrected by using a cylindrical lens? → 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. The eye resembles a - camera in many ways. Question 1. Refraction of Light through a Rectangular Glass Slab. Question 1: What kind of lens is present in the human eye ? Structure of Eye. Studyrankers is a free educational platform for cbse k-12 students. What kind of retinal cells are lacking in person suffering from this defect? As these slow down by different amounts, different colours are refracted through different angles which causes dispersion. stars appears to come from different directions. lamge distance in the eye is the distance between the eye lens and the retina and it is fixed. (iii) Pupil Write about power of accommodation of human eye. Extra Questions for Class 10 Science Chapter 11 Human Eye and Colourful World with Answers Solutions. Question 19. Question 20. State the objectives of organising such campaigns in schools. A transparent substance like prism, it recombines them to form a spectrum from and. 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