Question
White light is split into a spectrum by a prism and it is seen on a screen. If we put another identical inverted prism behind it in contact, what will be seen on the screen?
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Answer
(d)
First prism separates white light into its constituent colours which are then recombined by the second inverted prism into white light.
As two prisms combinedly form a glass slab, light beam is deviated on a parallel path.
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