Physics
Light of a single colour is passed through a liquid having a piece of glass suspended in it. On changing the temperature of the liquid, at a particular temperature, the glass piece is not seen.
(i) When is the glass piece not seen?
(ii) Why is the light of a single colour used?
Refraction Plane Surfaces
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Answer
(i) The glass piece is not seen when the refractive index of the liquid becomes equal to the refractive index of glass.
(ii) The light of a single colour is used as the refractive index of a medium (glass or liquid) is different for the light of different colours.
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