Laurence, Lionel · London, School of Optics · leaf 78
Fig. 68. regarded as a minute plane at right angles to a radius. Thus C E and C Bare normal to the surface at E and B respectively, and also when prolongedbeyond the circumference. Any ray AB or P E directed towards C passes into the medium withoutdeviation. A ray D E, which is not normal to the… … Fig. 69. normal P E C in the direction E F, if the medium is of a higher index of re-fraction, or it is bent away from the normal in the direction E G, if of a lowerindex than that of the medium from which the light proceeds. Both mediaare supposed to be of indefinite extent. Cx. and Cc.…
Optics
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