Three rays of light, namely red 
, green 
and blue
as shown in figure. 
The refractive indices of the material of the prism for red, green and blue wavelength are 
and 1.49 respectively. The colour of the ray(s) emerging out of the face PR is: red
Text Solution
Verified by ExpertsB
Assuming that the right-angled prism is an isoceles prism, so the other angles will be 
each.
Each incident ray will make an angle of 
with the normal at face PR.
The wavelength corresponding to which the incidence angle is less than the critical angle, will pass through PR.
critical angle
If 
the light ray will pass
Red will pass.
Green will not pass
Blue will not pass
So only red will pass through PR.
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