Fabrication of a parabolic mirror, it is proposed to make a backing for a parabolic mirror, by
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Fabrication of a parabolic mirror, it is proposed to make a backing for a parabolic mirror, by rotating a pan of slow-hardening plastic resin at constant speed until it hardens. Calculate the rotational speed required to produce a mirror of focal length f = 100 cm. The focal length is one-half the radius of curvature at the axis, which in turn is given by
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