A ray of light passes from denser medium to rarer medium
a. What happens to the refracted ray as the angle of incidence increases from `0^(@)` ?
b. What is the importance of the angle C (marked in the figure above )?
c. How is 'C' related to the refractive index 'n' of the medium ? Explain.

Explanation

a. The refracted ray propagates with an increased anle of refraction.
b. At the angle of incidence .C., the refracted ray just graces the surface separting the two media. Angle .C. is called critical angle .
c. Sin C = `(1)/(n) `