The radius of curvature of each surface of a convex lens having refractive index 1. 8 is 20 cm. The lens is now immersed in a liquid of refractive index 1. 5. The ratio of power of lens in air to its power in the liquid will be x : 1. The value of x is
Text Solution
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(4)
The power of a lens is given by
Using Lens Maker's formula,
and
Hence, the ratio is,
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