Fig. 5.1 shows a ray of light as it enters an optical fibre and travels through it.
(a)[2]
Calculate the refractive index for the glass used in the optical fibre.
(b)[2]
Explain why the ray of light undergoes total internal reflection at A.
(c)[1]
Both optical fibre and copper wire are used to transmit data. Optical fibre is cheaper and can carry more data per second than copper wire. State one further advantage of using optical fibre instead of copper wire to transmit data.
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “sin i / sin r, or equivalently sin 50 / sin 30” …