Phillips, Percy · London : T. C. & E. C. Jack ; New York : Dodge Pub. Co. · leaf 31
es from a medium in which its speed is greater into a 1 See note at the end of the chapter. 28 THE SCIENCE OF LIGHT medium in which its speed is less the refractive indexis greater than unity, and vice versa. When thewave-front is parallel to the surface each point willreach the surface at the same… … Fig. 13.Refraction by Parallel Plate.—If a plane wave passesthrough a plate of the medium with parallel surfaces itis evident that at the second surface it will be deviatedthrough the same angle into the original direction, thewave being simply displaced sideways by its passagethrough the plate.…
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