The material of prism used for obtaining spectrum of heat radiations is

rock salt

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quartz

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flint glass

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crown glass

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Solution

The correct option is C rock salt
We can't use any kinds of glass to get a heat radiation spectrum, because glass absorbs infrared radiation.
Rock salt doesn't absorb infrared radiation and hence it can be used.

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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.

δ = i + e - A

9^{\circ}

μ

1.60

μ

1.53

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