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When the object is at distance u(1)andu...

When the object is at distance `u_(1)`and`u_(2)`the images formed by the same lens are real and virtual respectively and of the same size.Then focal length of the lens is:

A

`1/2 sqrt(u_(1)u_(2))`

B

`1/2 (u_(1)+u_(2))`

C

`sqrt(u_(1)u_(2))`

D

`2 (u_(1)+u_(2))`

Text Solution

Verified by Experts

The correct Answer is:
B
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