Question

A lens immersed in a transparent liquid becomes invisible. Under what condition does it happen ?

Answer 1

Answer: it happens when the refractive index of the liquid is exactly equal to the refractive index of the material of the lens

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Explanation:

Answer 2

If the lens material and transparent liquid has the same refractive index, then it becomes invisible.

Hence when the  refractive index of liquid is equal to the  refractive index of lens , lens becomes invisible as velocity of light doesn't affect it.

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