An object is placed beyond the centre of curvature C of the given concave mirror. If the distance of the object is d1 from C and the distance of the image formed is d2 from C, the radius of curvature of this mirror is :
${{2{d_1}{d_2}} \over {{d_1} - {d_2}}}$
${{2{d_1}{d_2}} \over {{d_1} + {d_2}}}$
${{{d_1}{d_2}} \over {{d_1} + {d_2}}}$
${{{d_1}{d_2}} \over {{d_1} - {d_2}}}$
Solution
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