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# 414b - —.— I When light passes between media refraction...

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Unformatted text preview: —..— I When light passes between media, refraction occurs because the speed of light is different in the two media. The index of refraction of a medium is deﬁned as the ratio of the speed of light in a vacuum to the speed of light in the medium. I To understand why bending of light may occur with refraction, imagine a wave front entering a slower medium at an angle. The portion of the wave front entering ﬁrst {the right side of the wave front in the opposite image} is slowed down ﬁrst, before the rest of the wave front has yet moved into the new medium. The result is that the wave bends towards the normal as it moves into the slower medium. I The speed of light within a medium is inversely proportional to its index of refraction. The slower the medium, the greater the index of refraction. Be cause the frequency of a light ray is constant between media, it follows that the wavelength of the light must change. For example, if speed slows but frequency is the same, the wavelength must now be shorter. In other words, wavelength and speed are directly proportional between media. Wavelength and index of refraction are inversely proportional. A FnIil'CIFlITE CDNEEPT FDR CIDIIIPREHENSWE axons: WHEN A LIGHT RAT TRAVEIJ BETWEEN MEDIA, THE WAVELENGTH ADJUSTS TO THE NEW INDEX OF EEFME'I'IUN. Em .J WHEEL ...
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