A convex lens is immersed in a liquid, whose refractive index is equal to the refractive index of the material of the lens. Then its focal length will

Question

A convex lens is immersed in a liquid, whose refractive index is equal to the refractive index of the material of the lens. Then its focal length will, decrease, become zero, become infinite, remain the same

MARKS App · Accepted Answer

Given, a μ g = a μ l The focal length of convex lens in liquid f is given by 1 f = a μ g a μ l - 1 1 R 1 - 1 R 2 1 f = 1 - 1 1 R 1 - 1 R 2 1 f = 0 O r f = ∞ Its focal length will become infinite.

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