(a(i))[1]
A ray of light travels along a length of curved optical fibre. Draw a diagram to show the fibre and the route taken by the light ray.
(a(ii))[3]
Describe one medical use of optical fibres. A diagram may be included.
(b)[3]
Draw a line from each wave on the left to the speed that best matches it. The waves given are: light in air; microwaves in a vacuum; sound in steel. The speed options are: 90 m/s ($9\times10^1$), 6000 m/s ($6\times10^3$), 100000 m/s ($1\times10^5$), 1000000 m/s ($1\times10^6$), 300000000 m/s ($3\times10^8$), 60000000000 m/s ($6\times10^{10}$).
(c)[2]
Use the speed of light value from (b) to calculate the speed of light in this block.