ugh near the centre;it is possible therefore that a pencil of rays diverging from apoint such as Q may be refracted so as to converge to a point g,and the combination of prisms may thus form an image of Qat q. Again since the central portion ABCD is a plate, a raywhich traverses it is not deviated… … Fig. 80. the lengths of the lines AE EG etc. become extremely small,and the surfaces of the prisms may be treated as a continuouscurve instead of a number of small plane facets. In manycases the curves are portions of circular arcs. 69. Lenses. A portion of any transparent mediumbounded by two…
Heat · Light
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