Concept explainers
(a) A luminous point is moving at speed vo towards a spherical mirror with radius of curvature r, along the central axis of the mirror. Show that the image of this point is moving at speed
where p is the distance of the luminous point from the mirror at any given time. Now assume the mirror is concave, with r = 15 cm, and let vo = 5.0 cm/s. Find v1 when (b) p = 30 cm (far outside the focal point), (c) p = 8.0 cm (just outside the focal point), and (d) p = 10 mm (very near the mirror).
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