Three rays of light-red (R), green (G) and blue (B) are incident on the face AB of a right-angled prism ABC. The refractive indices of the material of the prism for red, green and blue wavelengths are 1.39, 1.14 and 1.47, respectively. Trace the path of the rays through the prism. How will the situation change if these rays were incident normally on one of the faces of an equilateral prism? BCR G B 45° C
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Answer:
Three light rays red(R), green (G) and blue(B) are incident on the right angled prisms abc at face ab.
The refractive indices of inertial of prism for red,green, blue wavelength are respectively
1.30
,
1.44
a
n
d
1.47
Finding the path of these rays reasoning out of the difference in their behaviour.
As red colour has maximum wavelength hence n for red is minimum. And critical angle for red is maximum hence except red colour, blue and green will incident at face AC more than the critical angle.