(a)[2]
On Fig. 8.1, cross out the incorrect parts and correct the diagram.
(b(i))[1]
State the value of the speed of light in a vacuum.
(b(ii)(1))[2]
For light in the material that makes up the optical fibre, calculate the refractive index.
(b(ii)(2))[2]
For light in the material that forms the optical fibre, calculate the critical angle.
(b(iii))[1]
State the full name of the process that occurs each time the light changes direction.