Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 79
IX of wliicli are so inclined to eaeh other that its sectionis a triangle, and its action on light passing throughit is to change the direction of the course of the beam.If we examine Fig. 21 we shall understand the actionclearly. It is a known law, that when a beam of lightfalls oljliquely on the… … Fig. 20.—View ami Section of a Piisni. the ray s, i, falling on the prism at i, is bent into thecourse T, e, which is in a direction nearer to that of n, i,produced inside the prism. On emerging, the reversetakes place, and the ray is bent away from the normalE, n, and takes the course E, e. In the…
Astronomy · Telescopes
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