The above arrangement explains about how white light is obtained again on the screen after passing through the prism P1 and P2.
a) what other functions of prism P1 and P2?
b) what is the necessary condition to get white light on the screen in the above diagram?
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(a) The glass prism P1 and P2 are to be combined together to produce dispersion without deviation.
(b) to get the light the original colour we place the prism inverted since one prism will be diverse the light rays and other inverted prism will converse light rays to form the original light.
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