A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 601
ction.By turning the disc into various positions, the corresponding anglesof incidence and refraction may be observed, and the relationsin ?7sinr = a constant, can be proved. 576 LIGHT CHAP. Further, by turning the disc so that the beam enters by thecurved and leaves by the plane surface, it may be… … sin COD --/x = FIG. 522. —Optical disc used to demonstratethe laws of refraction. sin AOB fj. Thus the index of refraction foran emergent ray is the reciprocal ofthat for an entering ray. As regards the first law ofrefraction, see the note on p.553 concerning reflection, whichapplies equally well…
Physics
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