Henderson, C. Hanford (Charles Hanford), 1861-1941, Woodhull, John F. (John Francis), 1857-1941 · New York, D. Appleton and company · leaf 343
bent toward the common perpendicular. When lightpasses into a medium of less density, the index is alwaysless than one, and the ray is bent away from the commonperpendicular. When the direction of a beam is reversed, the secondbecomes the reciprocal of the first. Thus, the index, whenlight passes… … Fig. 217.—Critical angle. because it is bent toward the common perpendicular; butthe ray can not always pass from a dense into a raremedium, for if the ray should be bent away from the com-mon perpendicular more than 90° it would fail altogetherto emerge from the denser medium. No ray of light…
Physics
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