Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
e secondmore dense than the first,and the third more densethan the second. A rayof light from the candle,incident at the foot of theperpendicular, N, will berefracted at the upper sur-face of E; and at the upper surface of V it will be again refracted,and at the upper surface of W it will lie still… … 220 OPTICS. Fig. 25.
Physics · Astronomy
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