What would happen if we put two glass prisms together? But one should not be both upright and one upside down, both Should be the same.
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Answer:Two prisms placed next to each other such that their adjacent sides are parallel ,behave like a glass slab because a ray of white light falling on the first prism will disperse the light into its seven contituent colours. ... This causes the spectrum or the band of seven colours to reunite and form the ray of white light.
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