Question

33 Three light rays, red (R). green (G) and blue (B) are incident on a right-angled prism ABC
at face AB The refractive indices of the material of the prism for red, green and blue
wavelengths are 1.39. 1.44 and 1.47 respectively,
Out of the three, which colour of ray will emerge out of face AC? Justify your answer.
Trace the path of these rays after passing through face AB.
A
A
Helt Ee Felt H₂
3​

Answer 1

Answer:

NR=1.39

ng=1.44

NB=1.47

when the three light rays say red, green and blue are made to incident on face ab of prism, then no refraction occurs at face ab.

out of three rays red ray will emerge out where as blue and green undergoes total internal reflection.

Reason :As red color has maximum wavelength,

hence n for red is minimum. And critical angle for red is maximum hence except red color , blue and green will incident at face AC more than critical angle.

Explanation:

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