(a(i))[1]
State the names of two components of the electromagnetic spectrum that have a smaller wavelength than ultraviolet radiation.
(a(ii))[1]
State one practical application of ultraviolet radiation.
(a(iii))[1]
Exposure to ultraviolet radiation from the Sun can damage the eyes. State one type of damage to the eye caused by ultraviolet radiation.
(b(i))[1]
Fig. 7.1 shows a ray of light. It enters a semi-circular block of glass at A and then leaves the glass at B, travelling along the surface to C. State the name given to the angle of incidence marked as $40^{\circ}$.
(b(ii))[2]
Calculate the refractive index for the glass.