(a)[1]
Explain why the light keeps the same direction as it enters the glass block at P.
(b(i))[3]
Calculate the angle between the normal and the ray in the air once the light leaves the block at Q.
(b(ii))[1]
On Fig. 8.1, sketch the route of the light in the air after it leaves at Q.
(c)[3]
Describe what happens to the light hitting the block at Q as this angle gets larger.