Theory: answer all nine questions. Show working and appropriate units; diagrams and alternative valid methods are marked against the original scheme.
(a)(i)Fig. 4.1 shows light through a triangular glass prism. State the angle of incidence at P, in degrees.
Answer guidance
State A short answer. No explanation is needed, and adding one cannot earn extra marks.
[1 mark]
(a)(ii)On Fig. 4.1 draw the normal at R and the correctly labelled angle of incidence there.
[2 marks]
(a)(iii)At Q in Fig. 4.1, state two conditions required for no light to refract from glass into air.
[2 marks]
(b)(i)Visible-light pulses carry internet information through glass fibres. Name one other electromagnetic radiation that can carry information through them.
Answer guidance
State A short answer. No explanation is needed, and adding one cannot earn extra marks.
[1 mark]
(b)(ii)State two advantages of glass fibres over copper wires for transmitting internet information.
Answer guidance
State A short answer. No explanation is needed, and adding one cannot earn extra marks.