A ray of light incident at an angle (theta) in a rectangular prism grazes the surface of the prism on emerging from the prism. Determine the value of the angle. [Absolute refractive index of the material of the prism is 1.5]
-
A.
41.8° -
B.
48.2° -
C.
60.8° -
D.
90.0°
Correct Answer: Option A
Explanation
(eta = frac{1}{sintheta})
(1.5 = frac{1}{sintheta})
(sintheta = frac{1}{1.5} = 0.667)
(theta = sin^{-1}(0.667) = 41.835°)
(approxeq 41.8°)