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Question

The focal length f of a mirror is given by 1f=1u+1v where u and v represent object and image distances respectively. The fractional error in 'f' is given by


A

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B

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C

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D

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Solution

The correct option is D


f=uvu+v,ff=uu+vv+(u+v)u+v=uu+vv+uu+v+vu+v


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