Name the prism required for obtaining the spectrum of infra red radiation

water

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glass

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quartz prism

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rock salt prism

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Solution

The correct option is C rock salt prism
Rock salt prism is used instead of glass prism to obtain infrared spectrum because infrared radiations are absorbed by glass but not by rock salt.

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Similar questions

Give reason for the following :

(i) Infrared radiations are used for photography in fog.

(ii) Infrared radiations are used for signals during the war.

(iii) The photographic darkrooms are provided with the infrared lamps.

(iv) A rock salt prism is used instead of a glass prism to obtain the infrared spectrum.

(v) A quartz prism is required for obtaining the spectrum of the ultraviolet light.

(vi) Ultraviolet bulbs have a quartz envelope instead of glass.

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