A lens, immersed in a liquid becomes invisible when Physics - Questions and Answers

A lens, immersed in a liquid becomes invisible when

(a)the focal length of the lens is zero

(b)the focal length of the lens is infinite

(c)the refractive index of the lens is less than the refractive index of the liquid

(d)the refractive index of the lens is equal to the refractive Right sign

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