Question

A ray of light in a glass is incident on a boundary with air .state what happens to the ray when the angle of incidence is less than the critical angle of glass

Answer 1

Explanation:

As we increase the angle of incidence, we reach a point where the angle of refraction is 90° and the refracted ray travels along the boundary of the two media. ... If the angle of incidence is bigger than this critical angle, the refracted ray will not emerge from the medium, but will be reflected back into the medium.

Answer 2

Explanation:

• We reach a point when the angle of refraction is 90° and the refracted ray travels along the boundary of the two mediums as the angle of incidence increases.
• If the angle of incidence is greater than this critical angle, the refracted beam will be reflected back into the medium rather than emerging from it.
• state what happens to the ray when the angle of incidence is less than the critical angle of glass.