A thin, symmetric double-convex lens of power P is cut into three parts A,B and C as shown. The power of
A
AisP
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B
Ais2P
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C
BisP2
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D
BisP4
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Solution
The correct options are AAisP CBisP2 Focal length of lens be f=1P focal length of A is f hence power is P but the focal length of B is 2f hence the power of B is P2.