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A lens if placed between a source of lig...

A lens if placed between a source of light and a wall. It forms images of area` A_(1)` and `A_(2)` on the wall for its two different positions. The area of the source or light is

A

`(A_(1) + A_(2))/(2)`

B

`[(1)/(A_(1)) + (1)/(A_(2))]^(-1)`

C

`sqrt(A_(1) A_(2))`

D

`[(sqrtA_(1) + sqrtA_(2))/(2)]^(2)`

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