(a(i))[4]
On Fig. 6.1, draw two rays from X so that the image position is determined. Add the image and label it IY. Then measure the distance from IY along the principal axis to the lens centre line.
(a(ii))[2]
State two reasons that make the image IY virtual.
(b)[3]
A ray of blue light enters the prism along the same path as the incident green ray. On Fig. 6.2, sketch the route of the blue light through the prism and out of it.