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Question

Light of a single colour is passed through a liquid having a piece of glass suspended in it. On changing the temperature of 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?

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Solution

(i) The glass piece is not seen when the refractive index of liquid becomes equal to the refractive index of glass.
(ii) Light of a single colour is used because the refractive index of a medium (glass or liquid) is different for the light of different colours.

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