A dentist uses a concave mirror of radius of curvature 20cm to obtain an enlarged upright image of a patient’s tooth.
(i) Find the focal length of the mirror.
(ii) For an erect image that is three times the size of the tooth, calculate how far the tooth should be placed from the pole of the mirror.
(iii) Determine the corresponding image distance for the situation in part (ii).
(iv) If the tooth is moved 2cm closer to the mirror, compute the new magnification produced.