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
B
5/3
C
5/4
D
6/5
Medium
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Updated on : 2022-09-05
Solution
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Correct option is B)
P1Pa=(μ1μg−1)(μaμg−1)=−100/100+5=+5
−5(μ1μg−1)=μaμg−1
μ11.5−1=5−1(1.5−1)=−0.1;μ1=0.91.5=35
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