Give reason for the following : (i) Infrared radiations are used for p

1.	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.
Answer» 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.

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.

Answer»

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.