(a(i))[4]
On Fig. 7.1, draw the ray path inside the prism accurately from face AB to face AC. A measurement from Fig. 7.1 and a calculation are both needed.
(a(ii))[1]
Determine the angle of incidence of this ray as it strikes face AC.
(b)[1]
Without any further measurement or calculation, sketch on Fig. 7.1 the approximate route of the ray after it passes through face AC.
(c(i))[2]
Complete the ray path to the left-hand end of the fibre.
(c(ii))[1]
Name the process occurring at X.