(a)[2]
On Fig. 6.1, extend the ray’s path.
(b(i))[2]
On Fig. 6.2, extend the ray’s path.
(b(ii))[1]
State the term used to describe what occurs to the light when it reaches the straight surface in Fig. 6.2.
(c)[2]
On Fig. 6.3, draw three wavefronts that have passed through the gap.