(a(i))[1]
On Fig. 7.1, draw in the normal at point P.
(a(ii))[2]
On Fig. 7.1, draw the route of the ray of red light through the glass prism and into the air.
(b)[1]
Describe any difference between the route of the blue ray in the prism and that of the red ray in the prism.
(c)[2]
State two conditions that must be met for a ray to be totally internally reflected.