Fig. 8.1 presents parallel wavefronts from a light wave in ice. These wavefronts strike a boundary with air. The speed of the light wave in air is $3.0 \times 10^{8}$ m/s. The refractive index of the ice is 1.3.
(a(i))[3]
On Fig. 8.1: draw the wavefronts for the wave entering the air.
(a(ii))[1]
On Fig. 8.1: draw arrows showing the direction in which the refracted wave travels.
(a(iii))[1]
On Fig. 8.1: label the angle of incidence $i$ and the angle of refraction $r$.
(b)[2]
Calculate the speed at which the light wave travels in the ice.
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Parallel wavefronts are shown in air.” …