A thin converging lens is made up of a glass of refractive index 1.5. It acts like a concave lens of focal length 50 cm when immersed in a liquid of refractive index (158) The focal length of the converging lens in air is (in m)
0.15
0.20
0.25
0.40
A
0.25
B
0.40
C
0.15
D
0.20
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Solution
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1f=(μ−1)(1R1−1R2)
f1f2=(μ2−1)(μ1−1)
50cmf=(1.5−1)(1−45)
500.5×0.2=f
f=0.2m
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