NCERT Solution for Class 10 Science Chapter 11
The Human Eye and the Colourful World
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-190
Questions No-2
A person with a myopic eye cannot see objects beyond 1.2 m distinctly. What should be the type of the corrective lens used to restore proper vision?
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Human eye can see objects clearly only when image is formed at retina. A person with a myopic eye cannot see objects beyond 1.2 m distinctly because, In a myopic eye, the image of a distant object is formed in front of the retina. This defect can be corrected by using a concave lens.
A person with a myopic eye can use concave lens to restore proper vision.
The person is able to see nearby objects clearly, but he is unable to see objects beyond
1.2 m because the image formed in front of the
retina.
To correct this defect of vision, he must use a concave lens. The concave lens will bring
the image back to the retina.
The person is able to see nearby objects clearly, but he is unable to see objects beyond
1.2 m. This happens because the image of an object beyond 1.2 m is formed in front of
the retina and not at the retina, as shown in the given figure.
To correct this defect of vision, he must use a concave lens. The concave le ns will bring
the image back to the retina as shown in the given figure.
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Myopia is defect in which a person is unable to see far objects, but can see near object.It can be corrected with the help of aconcave lensof suitable focal length.
A person with a myopic eye having the far point at 1.2 m should use a concave lens of focal length 1.2 m so as to restore proper vision.
A person with myopia, also known as nearsightedness, can see objects up close clearly but has difficulty seeing distant objects. Myopia occurs when the eyeball is too long or the cornea has too much curvature, causing light entering the eye to focus in front of the retina instead of directly on it.
To correct myopia and restore proper vision for distance viewing, a diverging or concave lens is used. A concave lens is thinner at the center and thicker at the edges. This type of lens helps to spread out the incoming light rays before they enter the eye, allowing them to converge properly on the retina. The use of a concave lens compensates for the excessive focusing power of the myopic eye.
In summary, for a person with myopia (nearsightedness) who cannot see objects beyond 1.2 meters distinctly, a concave or diverging lens should be prescribed to correct their vision for distant objects. The power of the concave lens would be determined by an eye examination, and it would be measured in diopters (D).