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Q.

A person who can see things most clearly at a distance of 10 cm. Requires spectacles to enable to him to see clearly things at a distance of 30 cm. What should be the focal length (in cm) of the spectacles?

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a

15 cm (Concave)

b

15 cm (Convex)

c

10 cm

d

0

answer is A.

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Detailed Solution

For lens u = wants to see = - 30 cmand v = can see = -10 cm∴1f=1v−1u=1−10−1−30⇒f=−15 cm

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A person who can see things most clearly at a distance of 10 cm. Requires spectacles to enable to him to see clearly things at a distance of 30 cm. What should be the focal length (in cm) of the spectacles?