The diagram shows a light ray travelling in glass and striking the boundary between the glass and air. What happens if the angle of incidence is increased so that it becomes greater than the critical angle for the glass?
- AThe angle of refraction becomes equal to $90^{\circ}$.
- BThere is a refracted ray and a ray reflected inside the glass.
- CThere is a refracted ray only.
- DThere is only a ray reflected inside the glass.