WAEC Physics 2025 Theory — Question 19

Model answer

Mirage: involves gradual refraction at boundaries as light passes through air layers of varying density; occurs on hot road surfaces or in deserts due to a temperature difference in the air layers; often observed on a hot road or in a desert. Total internal reflection: involves sudden reflection of light at a single boundary; occurs at an angle of incidence greater than the critical angle; observed in fibre optics and prisms.