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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 of right is (a) √(A_1 A_2 ) (b) (A_1+A_2)/2 (c) (A_1-A_2)/2 (d) 1/A_1 +1/A_2
(a)Size of images = A1 and A2. From the displacement method, the area of the source of light = √(A_1 A_2 ).
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