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An observer whose least distance of distinct vision is 'd' views the his own face in a convex mirror of radius of curvature 'r' .Prove that magnification produced can not exceed `(r )/(d+sqrt(d^(2)+r^(2)) `

A

`(r)/(d+sqrt(r^(2)+d^(2)))`

B

`(r)/(d+sqrt(r^(2)-d^(2)))`

C

`(r)/(d-sqrt(r+d))`

D

`(r)/(d+sqrt(d+r))`

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The correct Answer is:
A
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