(a)[2]
Calculate the critical angle for blue light in this kind of plastic.
(b(i))[1]
The blue light used in this experiment is monochromatic. State, in terms of a measurable quantity, what monochromatic means.
(b(ii))[2]
Calculate the angle of refraction for the light inside the block.
(b(iii))[1]
On Fig. 8.1, draw the route taken by the light that enters the block and the route of the light reflected at P.