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 wilbe
A
45 cm
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B
-12 cm
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C
-20 cm
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D
30 cm
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Solution
The correct option is B -12 cm We know that: 1f=1v−1u
Since, man suffering from myopia can see at distance of 10 cm clearly and he wants to read book at 60 cm, so he will use a lens that can make image of 60 cm at 10 cm, therefore,