In a concave mirror experiment, an objec...

In a concave mirror experiment, an object is placed at a distance `x_(1)` from the focus and the image is formed at a distance `x_(2)` from the focus. The focus length of the mirror would be

`x_1x_2`

`sqrtx_1x_2)`

`frac(x_1 + x_2)(2)`

`sqrtfrac(x_1)(x_2)`

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