(a(i))[2]
Calculate $n_R$.
(a(ii))[1]
On Fig. 8.1, sketch a line to show the route taken by the red light as it comes out of the glass prism. Mark this path R.
(a(iii))[1]
Explain why refractive index has no unit.
(b(i))[1]
A ray of violet light travels into the prism along the same route as the ray of red light. On Fig. 8.1, sketch a line to show the path of the violet light through the prism and as it emerges into the air. Label this path V.
(b(ii))[3]
State how the speed of light in glass varies with its frequency. Explain how this is shown by the dispersion of white light in the prism.