The Human Eye and the Colourful World

CBSE Class 10 Science · every board question from this chapter, 2023–2026

• The pair of eye parts responsible for admitting different amount of light in to the eyes is2026
• Vision defect far-sightedness is found in the eye defects named as:2026
• To restore clear vision in persons whose size of the eye ball has reduced, he/she is suggested to use suitable2026
• The vision defect which arises due to gradual weakening of the ciliary muscles and diminishing flexibility of eye lens is:2026
• When you look at an object very close to your eyes, the:2026
• Observe the given ray diagram showing refraction through a prism and choose the correct option for colour of rays 1 and 2: Colour…2026
• A thin beam of white light falls on a face of a glass prism and a spectrum is obtained on a screen. Which of the following…2026
• Assertion: When rays of white light pass through a prism, on emerging they give spectrum of seven colours. Reason (R): It is due…2026
• Attempt either or: What happens when light is scattered from (i) very fine particles and (ii) very large size particles of…2026
• (i) How does the change in curvature of the eye lens helps us in the process of seeing the nearby objects clearly? (ii) State the…2026
• Draw the ray diagram for refraction of light through a glass prism and mark angle of refraction and angle of deviation. When the…2026
• Study the given diagram and answer the questions that follow: Write the name of the eye defect shown in the diagram. Where is the…2026
• A person is unable to read a book placed closer than 1 meter from his eyes. Identify the defect of vision in his eyes. Draw the…2026
• Explain the phenomenon of rainbow formation in the sky. Draw the labelled ray diagram in support of your explanation.2026
• What is scattering of light? How is scattering of light different from reflection of light? Explain.2026
• What is Tyndall effect? What happens when sunlight is scattered from the particles of very large size? 'Danger' signals are…2026
• A person is suffering from a defect of vision due to the elongation of his/her eye ball. Write the name of the defect of vision…2026
• What is hypermetropia? Write any one cause of hypermetropia. With the help of a suitable ray diagram, explain how hypermetropia…2026
• Select the correct statement from the following:2025
• When a beam of white light passes through a region of very fine dust particles, the colour of light that scatters the most in…2025
• The curvature of eye lens of human eye2025
• In the human eye, most of the refraction for the light rays entering the eye occurs at the surface of:2025
• The part of the human eye which can modify the curvature of the eye lens to some extent is:2025
• The white light entering a glass prism, gets split into its constituent colours. It is observed that:2025
• The possible way to restore clear vision of those people whose eyeball has elongated is the use of suitable2025
• Most of the refraction for the light rays entering the eye occurs at2025
• The part of human eye which controls the amount of light entering into it.2025
• An old person is suffering from an eye defect caused by weakening of ciliary muscles and diminishing flexibility of the eye lens.…2025
• A boy while reading a book, keeps it much beyond 25 cm from his eyes. This defect of vision has arised because of2025
• The phenomenon responsible for making the smoke particles visible when a beam of sunlight enters a smoke filled room through a…2025
• Assertion: When ciliary muscles contract, eye lens becomes thin. Reason (R): Ciliary muscles control the power of the eye lens.2025
• Assertion: White light is dispersed by a glass prism into seven colours. Reason (R): The red light bends the least while the…2025
• Give reasons: (i) The sky appears dark to passengers flying at very high altitude. (ii) 'Danger' signal lights are red in colour.…2025
• A student has difficulty in reading his textbooks but can read the blackboard clearly while sitting in the last row. Name the…2025
• Draw a ray diagram to show the refraction of a ray of light passing through an equilateral glass prism. Mark the angle through…2025
• (i) Study the diagram and name the parts marked as A, B, C and D. (ii) Write the function of A and C.2025
• A person is suffering from an eye defect in which the far point of the eye is much nearer than infinity. Name the defect of…2025
• What is a rainbow? Draw a labelled diagram to show its formation.2025
• A person has to keep reading material much beyond 25 cm (say at 50 cm) from the eye for comfortable reading. Name the defect of…2025
• A person uses lenses of +2.0 D power in his spectacles for the correction of his vision. Name the defect of vision the person is…2025
• Draw a diagram to show the dispersion of white light by a glass prism. What is spectrum? Give reason for its formation.2025
• A person allowed a narrow beam of white light from the sun to enter a dark room through a small aperture and placed a glass prism…2025
• The students in a class took a thick sheet of cardboard and made a small hole in its centre. Sunlight was allowed to fall on this…2025
• When a beam of white light passes through a region having very fine dust particles, the colour of light mainly scattered in that…2024
• The phenomena of light involved in the formation of rainbow are:2024
• The Phenomena of light involved in the formation of a rainbow in the sky are2024
• The colour of light for which the refractive index of glass is minimum, is:2024
• Consider the following statements in the context of human eye: The diameter of the eye ball is about 2.3 cm. Iris is a dark…2024
• The lens system of human eye forms an image on a light sensitive screen, which is called as:2024
• In bifocal lenses used for the correction of presbyopia:2024
• Assertion: Red light signals are used to stop the vehicles on the road. Reason (R): Red coloured light is scattered the most so…2024
• Assertion: Myopic eye cannot see distant objects distinctly. Reason (R): For the correction of myopia converging lenses of…2024
• Assertion: The colour of clear sky appears blue. Reason (R): Light of blue colour has longer wavelength as compared to the light…2024
• Assertion: Red light signals are used to stop the vehicles on the road. Reason (R): Red coloured light is scattered the most so…2024
• Assertion: The rainbow is a natural spectrum of sunlight in the sky. Reason (R): Rainbow is formed in the sky when the sun is…2024
• When do we say that a particular person is suffering from hypermetropia? List two causes of this defect. Name the type of lens…2024
• What would have been the colour of the sky, if the Earth had no atmosphere? Give reason to justify your answer.2024
• A person suffering from an eye defect uses lenses of power -1 D. Name the defect of vision and list its two causes. State the…2024
• A person suffering from presbyopia needs bifocal lens. If he needs two lens of power - 4 · 0 dioptre and +2 · 0 dioptre, which…2024
• Name the phenomenon of light responsible for Tyndall effect. Write an event where this phenomenon can be observed.2024
• Define the term power of accommodation of human eye. Write the name of the part of eye which plays a major role in the process of…2024
• Define the term power of accommodation of human eye. What happens to the image distance in the eye when we increase the distance…2024
• Name and explain the phenomenon of light due to which the path of a beam of light becomes visible when it enters a smoke filled…2024
• Study the diagram given below and answer the questions that follow: (i) Name the defect of vision represented in the diagram.…2024
• Study the diagram given below and answer the questions that follow: (i) Name the defect of vision depicted in this diagram…2024
• A narrow beam, PQ of white light is passing through a glass prism ABC as shown in the diagram. Draw a ray diagram to show the…2024
• The change in the focal length of an eye lens in human beings is caused by the action of2023
• In the following diagram showing dispersion of white light by a glass prism, the colours 'P' and 'Q' respectively are -2023
• The phenomena of light involved in the formation of rainbow are2023
• In human eye the part which allows light to enter into the eye is -2023
• Assertion: The angle through which a ray of light bends on passing through a prism is called the angle of deviation. Reason (R):…2023
• Assertion: A person suffering from myopia cannot see the distant objects clearly. Reason (R): A converging lens is used for the…2023
• Two green plants are kept separately in oxygen free containers, one in the dark and other in sunlight. It was observed that plant…2023
• When and where does a rainbow appear in the sky? Draw a labelled ray diagram to show its formation. OR What is scattering of…2023
• A narrow beam XY of white light is passing through a glass prism ABC as shown in the diagram: Trace it on your answer sheet and…2023
• Observe the following diagram showing an image formation in an eye: Identify the defect of vision shown in the figure. List its…2023
• Observe the following diagram and answer the questions following it: (i) Identify the defect of vision shown. (ii) List its two…2023
• A person is suffering from an eye defect in which the far point of the eye is nearer than infinity. Identify the defect. List two…2023
• List two differences in the characteristic properties of the virtual images formed by the two types of spherical lenses (concave…2023
• Draw a labelled diagram of a common type of bifocal lens. State the function of each of its parts. Name the defect for the…2023
• A person is unable to see clearly a poster fixed on a distant wall. He however sees it clearly when standing at a distance of…2023
• State reasons for Myopia. With the help of ray diagrams, show the image formation by a myopic eye, and correction of myopia using…2023
• State one important function of the following parts of the human eye: (i) Retina (ii) Pupil State the role of ciliary muscles in…2023
• Give reasons for the following: Danger signals installed at airports and at the top of tall buildings are of red colour. The sky…2023
• Draw a labelled diagram to show (i) dispersion of a beam of white light, and (ii) formation of a rainbow.2023
• A person cannot see distinctly the object placed beyond 5 m from his eyes. Name the defect of vision the person is suffering…2023
• Define the term dispersion of white light. State the colour which bends (i) the most, (ii) the least while passing through a…2023

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