Name the prism required for obtaining the spectrum of ultraviolet light:

coal

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glass

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quartz prism

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water

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Solution

The correct option is C quartz prism
Quartz prism is used instead of glass prism to obtain ultraviolet spectrum because glass is nontransparent to UV radiation.

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Similar questions

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.

A ray of white light is passed through a glass prism and spectrum is obtained on a screen.

(a) Name the seven colours of the spectrum in order.

(b) Do the colours have the same width in the spectrum ?

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