Laurence, Lionel · London, School of Optics · leaf 58
IVREFRACTION AND THE REFRACTIVE INDEX The fact that the velocity of light is lessened in a dense medium is thecause of refraction. Normal Incidence.—When a beam of light, from air, is incident normallyon a dense medium such as a plate of glass, the whole of the wave-front isretarded simultaneously… … Fig. 44. increased in speed as it passes again into the rarer medium, so that its lineof progression still remains unchanged. Oblique Incidence of Light.—But if the plane wave-front A A (Fig. 44)be incident on the first surface obliquely, one partS meets the denser mediumsooner than the rest and is…
Optics
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