What exactly are 1.quartz and 2.rock salt prisms ? Which range of wavelengths of the electromagnetic spectrum
pass through each one of them?

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Solution

Quartz prism is required for obtaining the spectrum of Ultra violet.
UV radiation : wavelength range is from 100 Å to 4000 Å (or 10 nm to 400 nm).

Infrared spectrum can be obtained only with the help of a rock-salt prism since the rock-salt prism does not absorb infrared radiations whereas a glass prism absorbs them.
Infrared radiations are the electromagnetic waves of wavelength in the range of 8000Å to 10^7 Å.

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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.

10^{11} m < λ < 10^{- 11} m

10^{- 4} m < λ < 10^{- 6} m

State the name and the range of wavelength of the invisible electromagnetic waves beyond the red end of visible spectrum.

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