The focal length of a lens of refractive index μ is f. If the lens is immersed in a liquid of refractive index μ then the focal length of lens is
f2
2f
infinite
zero
A
2f
B
zero
C
infinite
D
f2
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Solution
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1f=(n−1)(1R1−1R2)
where, n is refractive index of lens material with respect to its surrounding medium
If lens is immersed in the liquid of refractive index equal to its own then n=1and hence above equation becomes: 1f=0
⇒f=∞
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