(a)[4]
On Fig. 6.1, show the normal clearly at Q, draw the ray reflected from point Q, and label the angle of reflection at Q with the letter r. State the law you used to construct the reflected ray.
(b)[1]
Compare the direction of the ray reflected from mirror 2 at Q with the direction of the ray incident on mirror 1 at P. Tick one box. The ray of light reflected from mirror 2 is parallel to the incident ray at P, perpendicular to the incident ray at P, or at an angle of 45^{\circ} to the incident ray at P.
(c(i))[1]
On Fig. 6.2, label one principal focus of the lens with the letter F.
(c(ii))[1]
State the focal length of the lens.