If white ray falls on the system in the given way then how many colours will we see after all dispersion has happened?

only 1 white ray

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only red colour

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only violet colour

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7 diffrent colours

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Solution

The correct option is D
7 diffrent colours

From 1st prism dispersion will happen from the second prism all the 7 colours will recombine and form the single white light again. then now this white light will again disperse into 7 different colours from the 3rd prism. so finally, we will have all the 7 colours.

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