Show that when rays parallel to the principal axis reflect from a concave mirror, the reflected rays

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Show that when rays parallel to the principal axis reflect from a concave mirror, the reflected rays all pass through the focal point at a distance R /2 from the vertex. Assume that the angles of incidence are small.
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Physics

ISBN: 978-0077339685

2nd edition

Authors: Alan Giambattista, Betty Richardson, Robert Richardson

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