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प्रश्न
Give reason for the following:
A rock salt prism is used instead of a glass prism to obtain the infrared spectrum.
उत्तर
The infrared spectrum can be obtained only with the help of a rock-salt prism, since the rock-salt prism does not absorb infrared radiation, whereas a glass prism does.
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संबंधित प्रश्न
Give one use of infrared radiations.
Mention three properties of infrared radiations similar to the visible light.
Give two such properties of infrared radiations which are not true for visible light.
Give reason for the following:
Infrared radiations are used for photography in fog.
Give reason for the following:
Infrared radiations are used as signals during war.
Give reason for the following:
The photographic darkrooms are provided with infrared lamps.
A radiation P is focused by a proper device on the bulb of a thermometer. Mercury in the thermometer shows a rapid increase. The radiation P is ______.
Name the material prism required for obtaining the spectrum of infrared radiation.
Name the radiations that are used for photography at night.
State one harmful effect of the infrared radiation.
