Hall, Edwin Herbert, 1855-1938 · New York, H. Holt and company · leaf 144
lumnwill, one part after another, wheel to the right until, whenthe whole front has entered the marsh, it will have the newdirection shown by the line AB. Substitute for thecolumn of troops a beam of light, and for the marsh ahighly refractive transparent substance, and one may getsome notion as to… … Fig. 94. glass, or some such transparent medium below the line. Aray of light Rx may come from beneath to the surface atsuch an angle with the normal that it will after refractionat 0 be parallel to the refracting surface. The ray Rt com-ing up to 0 at a larger angle with the normal will not…
Physics
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