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Unformatted text preview: 1 Refraction, the Snell law Light in geometric optics is discussed in rays and represented by a straight line with an arrow indicating the propagation direction. Light propagates in straight lines in homogenous medium. Light reflects on interface of two media, following the law of reflection: Light also refracts on the interface of two media, following Snells law of refraction: i r = Incident light Normal of the interface Reflected light 1 and 2 are both with respect to the normal of the interface. The parameters n 1 and n 2 are call the index of medium 1 and 2 respectively. 2 2 1 1 sin in n s n = Medium 1 Medium 2 1 2 2 Refraction, the index of refraction of a medium Light travels with the speed of light c in vacuum with c = 3.0010 8 m/sec . Light travels with a speed v in a transparent medium with v is always smaller than the c . The ratio of c to v is called the index of the refraction n of that medium and is weak function the light frequency. function the light frequency....
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