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Unformatted text preview: A useful result is obtained by setting r = R: F = B : That is, the ux at a surface of uniform brightness B is simply B . 3.4 Telescopes 3.4.1 Astronomical Telescopes All modern telescopes (optical, radio, X-ray) are mirrors, not lenses. However, mirror optics is just lens optics folded over: D D L L Since it is easier to draw lenses, we will use the left hand gure, but you should mentally translate it to the right-hand one. D is the aperture, L the focal length. The basic rules of ray tracing are:  rays go through center of lens unde ected  parallel rays get converged and come together at the focal length That is all we need to get: 38 ...
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