First slide

Ray optics

Question

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

Easy

A

Less refractive index
B

Higher refractive index
C

Same refractive index
D

Total internal reflection is zero

Solution

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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