Millions of people of the developing countries are suffering from corneal blindness. Prescribe a lens for spectacles so that he can see clearly up to 12 metres. stars appears to come from different directions. Atmospheric Refraction Effects. → Located in eye sockets in skull. (i) Apparent flickering of objects placed behind a hot object or fire. Eye defects. Write in one word or at the most in one sentence about the following: Question and Answer forum for K12 Students. Candidates who are ambitious to qualify the Class 10 with good score can check this article for Notes. Answer: → Due to this most of the blue light (shorter wavelength) are scattered away by the particles. Answer: Curvature decreases. Question 11. Question 12. Draw a ray diagram to show the dispersion of white light by a glass prism. Or The maximum accommodation of a normal eye is reached when the object is at a distance of 25 cm from the eyes. (iii) Pupil (i) most relaxed → Clouds are formed by water vapours. Question 1. The sun can be seen about two minutes before actual sunrise because of atmospheric refraction. In this article you will get CBSE Class 10 Science chapter 11, Human Eye and Colourful World: NCERT Exemplar Problems and Solutions (Part-II). → The air above hot surface becomes hot and rises. Answer: What eye defect is hypermetropia? What is meant by advance sunrise and delayed sunset. Answer: Explain the structure and function of such a lens. Class 10 Science MCQs Chapter 11 Human Eye and Colourful World. A rainbow is a natural spectrum appearing in the sky Raindrop after a rain. It is least scattered by fog and smoke and can be seen in the same colour over a long distance. Solution: (i) Concave mirror In most relaxed state. 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 light enters the rain drop, it first refracts and disperses. This is possible only when you have the best CBSE Class 10 Science study material and a smart preparation plan. accommodation. Answer: Question 7. 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. 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. NCERT Class 10 Science Unit 11 is for Human Eye and Colourful World. It is also called eyesight. Answer: Answer: 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. 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. Download free CBSE Sample paper for Class 10, Physics. → Diameter of eye ball – 2.3 cm. A concave lens of focal length 4 m should be used. These droplets behave as glass prism. Question 1. How does atmospheric refraction affect sunrise and sunset? Question 1: What kind of lens is present in the human eye ? Answer: Hence sun appears red. Question 4. Answer: Explain with an example. Question 9. Retina: To act as a screen to obtain the image of object and generate electrical signals which are sent to the brain via optic nerves. How is presbyopia corrected? Human Eye and Colourful World Extra Questions Very Short Answer Type. → 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. : The light of shorter wavelength (blue) of the visible spectrum is scattered more than the light of longer wavelength by the atmospheric particles. How does this happen? → Focal length of the eye lens becomes too long. 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. These are more effective in scattering light of shorter wavelengths at the blue end than light of longer wavelengths at the red end. A person can see clearly only up to 3 metres. The Human Eye: It is a natural optical instrument which is used to see the objects by human beings. (b) A glass slab acts as a combination of two identical glass prisms. This defect is then corrected by using bi-focal lenses of suitable focal lengths. The Human Eye and Its Structure ‘Human Eye’ is the organ of vision of the human body that enables us to see. What causes presbyopia? What type of defect of vision is he suffering from? → When white light is passed through a glass prism, it splits into its seven constituent colours to form a band of seven colours. Answer: 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. Answer: (2012 OD) Answer: The focal length of eye-lens can be changed by changing its shape by the action of ciliary muscles. The difference of time is about 2 minutes each for early rise and late setting of the Sun. Image Formation by Concave Mirror. The water droplets act like small prisms. The splitting of white light into its component colours is called dispersion of light. Question 10. Answer: (i) the eye defect myopia State its cause. (a) Lens becomes thin The -ve sign with f indicates the concave lens. Digital NCERT Books Class 10 Science pdf are always handy to use when you do not have access to physical copy. Pupil: To regulate and control the amount of light entering the eye. This wavering of light is an effect of atmospheric refraction. 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. Answer: → When the sun is below horizon, the rays have to pass from rarer to denser medium. The main parts of a human eye are: Sclera Lakhmir Singh Physics Class 10 Solutions The Human Eyes And The Colorful World. Lakhmir Singh Physics Class 10 Solutions Page No:269. Question 17. 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. Answer: Question 16. Our eye is the most important natural optical instrument. Question 11. Get class 10 study materials at BYJU'S. This is due to. A person cannot see objects nearer than 75 cm from his eyes while a person with normal vision can see objects upto 25 cm from his eyes. Objectives of organising such campaigns: Question 2. This defect can be corrected by using cylindrical lenses of suitable focal length and suitable axis in the spectacles. All colours of light travel at the same speed in a vacuum. (ii) Stars near the horizon appear slightly higher than their actual position. Why do different rays deviate differently in the prism? The focal length of the eye lens decreases. In this diagram, the angle of incidence, the angle of emergence and the angle of … The name of the defect is Presbyopia. Answer: This is because focal length of the lens of a normal human eye cannot be decreased below certain limit i.e., 25 cm. Answer: This is due to the ability of the eye lens to adjust its focal length which is known as accommodation. What is meant by ‘persistence of vision’? What is meant by dispersion of white light? Answer: → 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. ... With the help of ray diagram show: (i) the eye defect hypermetropia. Seven colours of spectrum are violet, indigo, blue, green, yellow, orange and red also known as ‘VIBGYOR’. (iv) Retina Extra Questions for Class 10 Science Chapter 11 Human Eye and Colourful World with Answers Solutions. 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. It is produced by dispersion of sunlight by tiny water droplets, present in the atmosphere. How does refraction of light take place in the atmosphere? 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. Question 24. Cone-shaped retinal cells are responsible for making a person differentiate between colours. (i) If particles are very fine, they scatter mainly the blue colour of light (shorter wavelength). ... 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. The far point of a normal human eye is at infinity. State the two causes of myopia. Question 2. What causes astigmatism? → Since the physical conditions of the earth’s atmosphere are not constant the light from. (a) What kind of defect in vision is she suffering from? (iii) He formed a spectrum from sunlight and placed an identical but inverted prism in front of prism forming the spectrum. Therefore, the sky appears blue from the surface of the Earth. Question 3. (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. Question 1. Question 21. 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? The tiny dust particles present in the air of room scatter the beam of light all around the room. Question 4. Question 3. → Wavelength of red light is about 1.8 times to that of blue light. The power of accommodation of the eye decreases with ageing. Use this phenomenon to explain why the clear sky appears blue or the sun appears reddish at sunrise. (i) Path of light becomes visible when light enters a dark and dusty room through a slit or ventilator. A person is advised to wear spectacles with convex lenses. THE HUMAN EYE & Colourful world. So he can see the objects clearly only in one plane. As these slow down by different amounts, different colours are refracted through different angles which causes dispersion. Each human eye sizes for approximately 2.5 cm in diameter. We are able to see the movie picture in a cinema hall. Answer: To understand social issues and problems. It has "nearly a spherical shape. The red light bends the least while the violet the most as shown below. → The angle of incidence should exceed critical angle, the light reflects in the denser medium. → Sometimes a person may suffer from both myopia and hypermetropia. 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. Tyndall effect can also be observed when sunlight passes through a canopy of a dense forest. Why does it take some time to see objects in a dim room when you enter the room from bright sunlight outside? Thus, its focal length increases. Answer: What type of defect of vision is he suffering from? (ii) Near point or 25 cm. The near point of an eye is also known as the least distance of distinct vision. This is why sun appear red in colour. What is Tyndall effect? 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. This defect is called presbyopia. Given, that u = – 25 cm and y = –75 cm. The atmospheric refraction of light occurs in a medium of gradually changing refractive index. What is astigmatism? State the objectives of organising such campaigns in schools. Answer: How can you along with your classmates contribute in this noble cause? Causes of hypermetropia: This defect arises because either: Hypermetropia can be corrected by using convex lens of suitable focal length in spectacles. Explain why it is so. The planets are much closer to the earth and are thus seen as extended sources. 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. The first prism splits the white light into its seven colour components. (iii) Advanced sunrise and delayed sunset. Question 4. A person needs a lens of power -4.5 D for correction of her vision. Following are the important function of the ear: Hearing. 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. NCERT Exemplar for Class 10 Science Chapter 11 The Human Eye and The Colourful World Multiple Choice Questions 1. Why does the sky appear dark to astronauts? During sunset and sunrise, the sun is near horizon and therefore the sunlight has to travel larger distance in atmosphere. Which defect of the eye can be corrected by using a cylindrical lens? 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 enhances the ability to detect faint objects. → So, the physical condition of the medium are not constant. Describe with a ray diagram how this defect of vision can be … • Lens: It is composed of a fibrous, jelly like material. All the NCERT exemplar solutions are framed in a systematic manner according to the latest CBSE class 10 science syllabus (2020-21). For most people, the near point gradually recedes and the far point comes closer. It is due to persistence of vision that we are able to see movie pictures in a cinema hall. Zigya App (a) What is hypermetropia? the focal length of the eye lens is too long, or. Explains the various defects that happen for human and also describes the ways to correct it. When a beam of light enters a smoke-filled dark room through a small hole, then its path becomes visible to us. Question 5. This is called internal reflection. Describe the formation of rainbow in the sky with the help of a diagram. 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. (ii) The smallest distance, at which the eye can see objects clearly without strain. Danger signal lights are red in colour because the red coloured light having longer wavelength is scattered the least by fog or smoke. Or When a ray of light falls on water drop (or raindrop) it undergoes refraction and dispersion to form a spectrum. A person is advised to wear spectacles with concave lenses. In which of the two cases is the focal length of the eye-lens more? The blue colour of the sky is due to the scattering of sunlight by the molecules of the atmosphere. Answer: Answer: Question 2. (a) Myopia This disease can be cured by replacing the defective cornea with the cornea of a donated eye. 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. The human eye is the natural convex lens that refracts light. When we look at the sky, the scattered light enters our eyes which majorly contains blue, colour and hence the sky appears blue. 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. 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. Bifocal lens is required to improve the vision. Give reason. The defect of the eye due to which a person is unable to distinguish between certain colours, is known as colour blindness. 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. When a monochromatic light having only one wavelength, passes through a prism, will it show dispersion? Answer: As a result, the cornea has different curvatures in different directions of the horizontal and vertical planes. Thus, scattering of light makes the particles visible. The eye lens becomes thicker. It provides most of the refraction of light. Spreading of light in various directions by colloid particles. Question 19. For an astronaut, the sky would appear dark because in space there is no atmosphere to scatter light. (a) What is dispersion of white light? However, there is lateral displacement. Answer: What is presbyopia? The twinkling of a star is due to atmospheric refraction of starlight. What do you understand by spectrum of white light? Name the various colours of spectrum of white light in proper sequence. Explain, why a normal eye is not able to see distinctly the objects placed closer than 25 cm. Since we see the blue light from everywhere overhead, the sky appears blue. → Use of convex lens of suitable power can correct the defect. Why there is no dispersion of light refracted through a rectangular glass slab? → The sun appears about two minutes earlier than actual sunrise and the sun remains visible for about two minutes after actual sunset. The defect of the vision is hypermetropia. Solution: This enables us to see nearby objects clearly. Given: = -25 cm. Human Eye: working of human eye, Persistence of vision, Power of accommodation of human eye, Defects of vision. Malfunctions of Eyes: Cataract: In old age the cornea becomes cloudy. The molecules of air and other fine particles in the atmosphere have size smaller than the wavelength of visible light. (b) Curvature increrases. Human Eye and Colourful World Class 10 Important Questions Short Answer Type I. (ii) Iris What is the cause of dispersion? At sunrise and sunset when the sun is below the horizon, the light rays starting from sun are incident on these layers. This increases the curvature of the eye lens. This phenomenon is called dispersion. ... 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 … Draw a ray diagram showing the dispersion through a prism when a narrow beam … Answer: b. In the following diagram, the path of a ray of light passing through a glass prism is shown below. A Glimpse of CBSE Class 10 Science Marking Scheme 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. → While sunset and sunrise, the colour of the sun and its surrounding appear red. What is colour-blindness? CBSE Class-10 Revision Notes and Key Points. Cornea: Refraction of the light rays falling on the eye. So, danger signs are made in red colour. → The refractive index of earth’s atmosphere in general increases from top to bottom. When these colour components fall on the second prism, it recombines them to form white light. Question 20. Student sitting at the back bench in a class is not able to see what is written on the blackboard. Formation of Rainbow. The upper part of the lens is a concave lens which corrects myopia to see the distant objects clearly, while the lower part of the lens has convex lens which corrects the hypermetropia to see the nearby objects clearly. The person with … Answer: Focal length increases. Answer: Refraction of Light through a Rectangular Glass Slab. The space is occupied by cool air. • Three phenomenon which are involved in rainbow formation are : → Some water droplets remain suspended in air after rain. State reason to justify your answer. Answer: Question 1. Question 8. With the help of labelled ray diagrams show State the functions of each of the following parts of the human eye: Question 2. He … As a result the sun appears higher than its actual position. To the observer O these rays appear to come from B which is above horizon. 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. For scattering of light, particles are required. Class 1 - 3; Class 4 - 5; Class 6 - 10; Class 11 - 12; CBSE. → 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. → 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. State one role of ciliary muscles in the human eye. 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. The pictures in the form of a long film are projected on the screen at a rate of about 24 pictures per second. Write the name of this defect. Download free PDF of best NCERT Solutions , Class 10, Physics, CBSE- Human Eye and the Colourful World . Question 6. Water vapours condense to form water droplets due to larger size of droplets, all colours of light are scattered and clouds appear white. Question 10. 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 the old person having presbyopia gradually recedes and becomes much more than 25 cm away. The human eye(s) are located in the specialized sockets carved out in the human skull. The scattering of light by particles in its path is called Tyndall effect. → It is done by using concave lens of appropriate power. Answer: (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. … Answer: Describe the formation of rainbow in the sky with the help of a diagram. Draw a labelled diagram to explain. A collection of questions on CBSE- Human Eye and the Colourful World with solutions created by best teachers are available as a PDF download. It is like a camera which has a lens and screen system. Question 5. The band of the coloured components formed due to dispersion of white light is called ‘spectrum’. When sunlight passes through the atmosphere, the fine particles in air scatter the blue colour more strongly than red. → Violet is the most deviated colour as it has smallest wavelength in visible spectrum. 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