Question

what happens when two prisams are kept straight and passed a white light in it
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Answer 1

Answer:

when the 2 prisms are kept straight in a line and a white light is passed in it, the light is separated in 7 Colors of rainbow.A rainbow is formed.

Answer 2

First the light will deviate into seven colours when it passes one prism

Then by passing to other prism it changes to it's original light