Total internal reflection may occur when light reaches a water–air boundary.
Under which conditions is light totally internally reflected?
| Medium in which light travels towards the boundary | Angle of incidence | |
|---|---|---|
| A | water | less than the critical angle |
| B | water | greater than the critical angle |
| C | air | greater than the critical angle |
| D | air | less than the critical angle |
Medium: water, Angle of incidence: less than the critical angle
Medium: water, Angle of incidence: greater than the critical angle
Medium: air, Angle of incidence: greater than the critical angle
Medium: air, Angle of incidence: less than the critical angle
100 exam-style questions on CIE IGCSE Physics 3.2.2 Refraction of light. Each one has a worked solution and a mark scheme showing where the marks go.