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With a concave mirror, an object is plac...

With a concave mirror, an object is placed at a distance `x_(1)` from the princiipal focus, on the principal axis. The image is formed at a distance `x_(2)` from the principal focus. The focal length of the mirror is

A

`x_1 x_2`

B

`(x_1+x_2)/2`

C

`sqrt(x_1/x_2)`

D

`sqrt(x_1x_2)`

Text Solution

Verified by Experts

The correct Answer is:
D
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