A body is located on a wall. Its image of equal size is to be obtained on a parallel wall with the help of a convex lens. The lens is placed at a distance d ahead of second wall, then the required focal length will be:
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a
Only d4
b
Only d2
c
More than d4 but less than d2
d
Less than d4
answer is B.
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Detailed Solution
The lens formula can be written as1f=1v+1u …(1)Given, v = dFor equal size image|v|=|u|=dBy sign convention, u=−d∴ 1f=1d+1d or