A lens is placed between a source of light and a wall. It forms images of area A1 and A2 on the wall for its two different positions. The area of the source or light is
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a
A1+A22
b
1A1+1A2−1
c
A1A2
d
A1+A222
answer is C.
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Detailed Solution
m1=A1O and m2=A2O ⇒m1m2=A1A2O2 Also it can be proved that m1m2=1 So O=A1A2