(a)[2]
On Fig. 7.1, sketch the route taken by the red-light ray as it passes through the glass block and emerges into air.
(b)[1]
State the other five colours of the visible spectrum in the correct sequence.
(c(i))[1]
In Fig. 7.3, one region has not been labelled. State the name of the unlabelled region.
(c(ii))[1]
Describe one application of gamma rays.
(c(iii))[1]
Describe one harmful effect on people from excessive exposure to gamma rays.