Fig. 7.1 illustrates a ray of light falling on a rectangular glass block at point X, where the ray is refracted.
(a)[1]
On Fig. 7.1, construct the normal at X.
(b)[1]
On Fig. 7.1, draw the route of the ray through the glass block until it arrives at the surface RS.
(c)[2]
On Fig. 7.1, at X, mark the angle of incidence with a letter $i$ and the angle of refraction with a letter $r$.
(d)[1]
On Fig. 7.1, draw the path taken by the ray of light as it leaves the glass block.
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