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 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 =−30cm and v= can see =−10cm ∴1f=1v−1u=1−10−1(−30)⇒f=−15cm