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 isA. `(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)`

A lens if placed between a source of light and a wall. It forms images

1.	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 isA. `(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)`
Answer» Correct Answer - c

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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 isA. `(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)`

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