Fig. 7.1 shows two light rays striking a thin converging lens. Both rays are parallel to the principal axis. $F_2$ and $F_1$ are the focal points of the lens.
(a)[2]
In Fig. 7.1, extend each ray beyond the lens until it reaches the screen.
(b)[1]
State one region of the electromagnetic spectrum that has wavelengths longer than those of visible light.
(c(i))[1]
Describe one practical use of gamma rays.
(c(ii))[1]
Describe one harmful effect on people of too much exposure to gamma rays.
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “both rays refracted towards the principal axis” …