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Q.

What is the focal length of a concave lens which is used to correct myopia?

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a

Less than the distance of far point from the eye

b

Equal to the distance of far point from the eye

c

Equal to

20 cm

d

Equal to

125 cm

answer is B.

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Detailed Solution

The focal length of the concave lens required to correct myopia is equal to the distance of far point from the eye
A person with myopia cannot see distant objects clearly because the far point for that person is closer than infinity. In short-sightedness, the eye is able to see clearly up to the far point. Therefore, the light coming from the distant object after passing through the concave lens should focus on the far point. Now the image formed by the concave lens will act as an object for the eye lens.

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