A man suffering from myopia can read a book placed at 10 cm distance. For reading the book at a distance of 60 cm with relaxed vision, focal length of the lens required will be
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a
45 cm
b
– 20 cm
c
– 12 cm
d
30 cm
answer is C.
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Detailed Solution
For lens u = want’s to see = -60 cmv = can see = -10 cm∴1f=1v−1u⇒1f=1−10−1(−60)⇒f=−12cm