Q. A beam of light consisting of red, green and blue colours is incident on a right-angled prism $ABC.$The refractive indices of the material of the prism for the above red, green and blue wavelengths are 1.39, 1.44 and 1.47 respectively. The colour/colours transmitted through the face $AC$ of the prism will be
A) Red only
B) Red and green
C) All the three
D) None of these
Explanation
(a) The refractive index$\ \mu = \frac{1}{\sin\theta_{C}}$
$\mu = \frac{1}{\sin{45{^\circ}}} = \sqrt{2} = 1.414$
Because the refractive index for green is 1.44 and blue is 1.47. So, red alone will be transmitted.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.