If the white ray falls on the system arranged in the given way, then be the topmost colour of the output light coming from the third prism.

red

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yellow

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violet

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blue

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Solution

The correct option is C violet
After passing through the combination of the first two prisms, light will come out undispersed. Now, this white light will pass through the upside down prism which will produce the spectrum with violet at top and red at the bottom. Hence, violet will be the answer.

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