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Question

A thin convergent glass lens (μg=1.5) has a power of +5.0 D. When this lens is immersed in a liquid of refractive index μ, it acts as a divergent lens of focal length 100 cm. The value of μ must be

A
4/3
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B
5/3
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C
5/4
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D
6/5
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Solution

The correct option is B 5/3
PaP1=(μgμa1)(μgμ11)=+5100/100=+5

5(μgμ11)=μgμa1

1.5μ11=15(1.51)=0.1;μ1=1.50.9=53

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