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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

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

Text Solution

Verified by Experts

The correct Answer is:
c
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