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A lens immersed in a transparent liquid is not visible. Under what condition can this happen?

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in Physics – Class 12 by (135k points)
A lens immersed in a transparent liquid is not visible. Under what condition can this happen?

(a) Less refractive index

(b) Higher refractive index

(c) Same refractive index

(d) Total internal reflection is zero

The question was posed to me in examination.

Question is from Ray Optics in portion Ray Optics and Optical Instruments of Physics – Class 12

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Best answer
Right answer is (c) Same refractive index

The explanation is: When the refractive index of the liquid is the same as the lens material, no light will be reflected by the lens and hence it will not be visible. So, the lens immersed in a transparent liquid will not be visible.

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