(a(i))[1]
State what happens to the ray when the angle of incidence of the ray is less than the critical angle of the glass.
(a(ii))[1]
State what happens to the ray when the angle of incidence of the ray is greater than the critical angle of the glass.
(b(i))[2]
On Fig. 6.1, without calculating, extend the ray from point B until it emerges from the glass block.
(b(ii))[2]
Calculate the refractive index for the glass.