Question

Total internal reflection may occur when light travels
from
(a) vacuum to air
(b) water to glass
(c) air to glass
(d) glass to water

Please explain the answer also..​

Answer 1

Explanation:

For total internal reflection to occur the light must travel from a dense medium to a less dense medium (e.g. glass to air or water to air). As the angle of incidence increases so does the angle of refraction.

the light must be travelling from a more dense medium into a less dense medium (ie glass to air) the angle of incidence must be greater than the critical angle.