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प्रश्न
Give reason for the following:
Infrared radiations are used for photography in fog.
Why are infra-red radiation’s preferred over ordinary visible light for taking photographs in the fog?
उत्तर
Infrared radiations are used in photography in fog because they are not much scattered by the atmosphere, so they can penetrate appreciably through it.
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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 as signals during war.
Give reason for the following:
The photographic darkrooms are provided with infrared lamps.
Give reason for the following:
A rock salt prism is used instead of a glass prism to obtain the infrared spectrum.
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.
Assertion (A): Infrared radiations travel long distance through a dense fog and mist.
Reason (R): Infrared radiations undergo minimal scattering in earth's atmosphere.
State one harmful effect of the infrared radiation.
