Question

A glass lens of refractive index 1.5 is placed in a trough of liquid. What must be the refractive index of liquid to make the lens disaapear

Answer 1

Answer:

liquid should have same refractive index as of glass i.e., 1.5 so the light passes from liq will not deviate when passing through lense .

And hence lense will not appear from any corner of liquid

Answer 2

1.5 must be the refractive index of the liquid with respect to the air.

Explanation:

• The refractive index of the glass lens is 1.5, then it can be made to disappear if it is immersed in a liquid of same optical density. Then the refractive index of the liquid with respect to air is also 1.5 and the refractive index of the liquid with respect to the glass is 1.

• Then the light will go undeviated even after passing through different medium because the speed of the light will not change.

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TOPIC: same optical density

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