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Updated on : 2022-09-05

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Correct option is B)

$μ_{1}=1.5f_{1}=0.2mf_{2}=(−0.5)μ_{2}=?$

Using lens makers formula and taking ratios, $f_{2}f_{1} =(μ_{1}−1)(μ_{2}−1) $

$⇒(−0.5)0.2 =(1.5−1)(μ_{e}1.5 −1) $

$⇒μ_{e}1.5 =0.8$

$⇒μ_{e}=815 $

Using lens makers formula and taking ratios, $f_{2}f_{1} =(μ_{1}−1)(μ_{2}−1) $

$⇒(−0.5)0.2 =(1.5−1)(μ_{e}1.5 −1) $

$⇒0.50.2×0.5 =(1−μ_{e}1.5 )$

$⇒μ_{e}1.5 =0.8$

$⇒μ_{e}=815 $

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