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An object is placed beyond the centre of...

An object is placed beyond the centre of curvature C of the given concave mirror . If the distance of the object is `d_(1)` from C and the distance of the image formed is `d_(2)` from C , the radius of curvature of this mirror is

A

`(d_(1)d_(2))/(d_(1)+d_(2))`

B

`(d_(1)d_(2))/(d_(1)-d_(2))`

C

`(2d_(1)d_(2))/(d_(1)-d_(2))`

D

`(2d_(1)d_(2))/(d_(1)+d_(2))`

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