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An object is at a distance of 10 cm from...

An object is at a distance of 10 cm from a concave mirror and the image of the object is at a distance of 30 cm from the mirror on the same side as that of the object. The radius of curvature of the concave mirror is

A

`+15.0 cm`

B

`+7.5 cm`

C

`-7.5 cm`

D

`-15.0 cm`

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