Ch0227 - Chapter 27 Refraction, Dispersion, Internal...

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Chapter 27 Refraction, Dispersion, Internal Reflection 237 27 Refraction, Dispersion, Internal Reflection When we talked about thin film interference, we said that when light encounters a smooth interface between two transparent media, some of the light gets through, and some bounces off. There we limited the discussion to the case of normal incidence. (Recall that normal means perpendicular to and normal incidence is the case where the direction in which the light is traveling is perpendicular to the interface.) Now we consider the case in which light shining on the smooth interface between two transparent media, is not normally incident upon the interface. Here’s a “clean” depiction of what I’m talking about: and here’s one that’s all cluttered up with labels providing terminology that you need to know: n 1 n 2 θ 2 1 R n 1 n 2 2 1 R The Normal Incident Ray The Transmitted Ray, a.k.a. the Refracted Ray The straight- ahead path. The Normal The Angle of Refraction The Angle of Incidence The Angle of Reflection The index of refraction of the medium in which the light is originally traveling. The index of refraction of the medium in which the light is traveling after it passes through the interface. The interface between the two transparent media. Reflected Ray at R = 1 in Accord with the Law of Reflection
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Chapter 27 Refraction, Dispersion, Internal Reflection 238 As in the case of normal incidence, some of the light is reflected and some of it is transmitted through the interface. Here we focus our attention on the light that gets through. Experimentally we find that the light that gets through travels along a different straight line path than the one along which the incoming ray travels. As such, the transmitted ray makes an angle θ 2 with the normal that is different from the angle 1 that the incident ray makes with the normal. The adoption of a new path by the transmitted ray, at the interface between two transparent
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This note was uploaded on 02/29/2012 for the course PHYS 227 taught by Professor Rabe during the Fall '08 term at Rutgers.

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Ch0227 - Chapter 27 Refraction, Dispersion, Internal...

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