it. This is made use of in Galileos Telescope (Fig. 112). Thisconsists of a convex lens of long focal length forming an objectglass and a concave lens of small focal length on the same axis 1 For an account of these see Glazebrook, Physical Optics, Text-bookof Science Series, Chapter IV. 98-100]… … Fig. 112. from the object glass equal to its focal length. But beforereaching p they are intercepted by the concave lens bac, whichforms the eyepiece, placed in such a position that aq is its focallength. The rays therefore emerge from the lens as a parallelpencil parallel to ap and capable of…
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