(a(i))[1]
On Fig. 8.1, draw the normal at X where the ray meets the flat surface.
(a(ii))[1]
On Fig. 8.1, label the angle of refraction. Put the letter R as the label.
(a(iii))[1]
State the name of one other item of equipment that he needs for the investigation.
(b)[2]
On Fig. 8.2, draw the route of the ray after it strikes the flat surface.