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(a) What happens when a ray of ordinary light is passed through a triangular glass prism?(b) What will happen if another similar glass prism is placed upside down behind the first prism?
(a) When a ray of ordinary light is passed through a triangular glass prism, the light splits into a spectrum of seven colours. This phenomenon of splitting ordinary (or, white) light into its seven constituent colours (violet, indigo, blue, green, yellow, orange and red) is known as 'dispersion of light'.
(b) If a second similar glass prism is placed upside down behind the first prism, recombination of seven colours takes place and a beam of ordinary white light is obtained on a screen placed behind the second prism. The recombination of colours took place because the second prism was placed in an inverted position with respect to the first prism, due to which the refraction produced by the second prism was equal and opposite to the refraction produced by the first prism.
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