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Q.

 A ____ is a band of seven constituent colors, obtained on a screen when a ray of white light passes through a transparent triangular glass prism.


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Detailed Solution

A spectrum is a band of seven constituent colours obtained on a screen when a ray of white light passes through a transparent triangular glass prism.
When a ray of ordinary light is passed through a triangular glass prism, it splits to form a band of seven colours: violet, green, indigo, orange, blue, yellow, and red. A spectrum is a band of these seven colours obtained on a screen. A 'triangular glass-shaped prism' is used to create a spectrum of white light. The role of a triangular glass prism is to separate these seven constituent colours of the white light.
 
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