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Three rays of light, namely red (R), gre...

Three rays of light, namely red (R), green (G) and blue (B) are incident on the face PQ of a right angled prism PQR as showns in the figure.
The refractive indices of the material of the prism for red green and blue wavelength are 1.27, 1.42 and 1.49 respectively. The colour of the ray(s) emerging out of the face PR is:

A

red

B

green

C

blue and green

D

blue

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