At A, a light ray in air meets a parallel-sided glass block. The angle between the side of the block and the ray of light in air is $35^\circ$. The ray then reaches the block’s edge at B, and Fig. 7.1 shows the light ray together with the glass block.
At A, the angle of refraction in the glass is $33^\circ$.
(a)[2]
Calculate the refractive index of the light in the glass.
(b(i))[1]
The light is totally internally reflected at B. State one requirement for total internal reflection to take place.
(b(ii))[1]
On Fig. 7.1, extend the ray to show the light’s path after total internal reflection at B and until it emerges from the block.
Worked solution & mark scheme
This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Use the relation $n = \sin i / \sin r$” …