A converging lens of refractive index 1.5 kept in a liquid medium having the same refractive index. What would be the focal length of the lens in this medium?
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Refractive index of the lens = 1.5 =Refractive index of medium
the lens in a medium (liquid) will be act like a plane of glass.
Its focal length will be infinte
By using the formula of lens maker.
1/f = (u - 1) (1/R1 - 1/R2)
1/f = (u2/u1 -1) (1/R1 - 1/R2)
u1 = u2
1/f = 0
thus, f = infinity
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