Answer to Question #15139 in Optics for thabitha

Question #15139
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 spectrum 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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