Which statement about total internal reflection at a water-air boundary is correct?
The light must be traveling from air into water.
The critical angle increases as the refractive index of the medium increases.
The angle of incidence inside the water must be greater than the critical angle.
The speed of light in water must be greater than the speed of light in air.
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.