Bihar Police Constable 14-Mar-2021 Solved Paper

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Question : 84 of 100

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Mirror formula is

f = u + v
$f = \;{1}/{u} + \;{1}/{v}$
$f = \;{u\;+\;v}/{uv}$
$\;{1}/{f} = \;{1}/{u} + \;{1}/{v}$

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