Explain the following :1. Infrared radiations are used for photography in fog.
2. Infrared radiations are used for signals during war .
3.The photographic darkrooms are provided with infrared lamps.
4.A rocksaltprism is used instead of a glass prism to obtain the infrared
5. A qartz prism is reqiured for obtaining the spectrum of a violet light .
6. Ultraviolet bulbs have a quartz envelope instead of glass.
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