Question

Under what conditions a lens when placed in a transparent liquid becomes invisible???

Answer 1

Answer:

A lens when placed in a transparent liquid becomes invisible when the refractive index of material of lens is equal to the refractive index of liquid , there would be no bending of light when it travels from lens to liquid and both will behave like same entities . so the effect of lens would disappear or it would become invisible .

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Answer 2

Answer:

When refractive index of the material of lens is equal to the refractive index of the liquid, there would be no bending of light when it travels from the lens to the liquid and both will start behaving as if they are same entities

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