Answer:
The critical angle is 34 degree.
Explanation:
Given the index refraction = 1.77
We have to find the critical angle of sapphire when the air has the index of refraction of 1.0.
Use the below formula to find the angle.
sin(θ)c = 1 / n
sin(θ) c = 1 / 1.77
(θ) c = Sin^-1 (0.565)
= 34.4 degree
= 34 degrees.
Thus, the critical angle is 34 degree.
