(a(i))[1]
State what this line is called.
(a(ii))[1]
State which of w, x, y or z represents the angle of reflection.
(b(i))[1]
State the colours in the correct sequence. The first one has already been completed for you. colour at S: red ... colour at T: ...
(b(ii))[3]
On Fig. 6.3, complete the path of the light ray. Explain your answer.