A boy cannot see an image hanging on a wall placed at a distance of $3 m$ from him. With the help of a ____ lens he can see that image properly.

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Detailed Solution

A boy cannot see an image hanging on a wall placed at a distance of

3 m

from him. With the help of a concave lens he can see that image properly.
A boy cannot see an image hanging on a wall placed at a distance of 3 m from him because he is suffering from myopia. It is also known as near-sightedness. However, with the help of a concave lens, he can see that image properly. Myopia is the defect in the eye when a person can see nearby objects clearly, but objects farther away appear blurry to him. This is because the image is formed in front of the retina instead of on the retina. Using a concave lens, this defect can be minimized as the concave lens helps to form the image at the surface of the retina.

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