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

A lens is 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 of 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
Area of source or light (i.e. size of object)
O = `sqrt(A_(1) A_(2))` .
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