Physics
Name the material of prism required for obtaining the spectrum of (a) ultraviolet light, (b) infrared radiations.
Answer
(a) Ultraviolet radiations are absorbed through glass, but can pass through quartz. Therefore, to obtain the ultraviolet spectrum from its source, a quartz prism is used.
(b) Infrared radiations are absorbed by glass, but they can pass through rock salt. Hence, a rock salt prism is used to obtain an infrared spectrum.
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