Fig. 6.1 traces the route of a red-light ray through a glass block in air.
For the red light passing from glass into air, the critical angle is 43^{\circ}.
The labels on Fig. 6.1 are: air; glass block; ray of red light; points A, B, C; a dashed normal line at A; an angle of 62^{\circ} at B; angle P.
(a(i))[1]
On Fig. 6.1, show the angle of incidence at A. Label that angle with the letter X.
(a(ii))[1]
State the name of the process taking place at A.
(a(iii))[1]
State the name used for the dashed line at A.
(b(i))[1]
State the value of angle P.
(b(ii))[2]
State the name of the process taking place at B.
(c)[1]
On Fig. 6.1, sketch the path followed by the ray of red light as it travels from C into the air.
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “angle of incidence correctly identified (with \times placed between normal and incident ray)” …