Laurence, Lionel · London, School of Optics · leaf 66
With an equilateral prism ABC (Fig. 51) a ray DE incident normally onthe surface AB is reflected at the surface AC in the direction EG, and emergesnormally from the third surface BC. The deviation of the ray is FEG=6Q°,that is, the same as the principal angle A. … Fig. 52.
Optics
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