Lecture 2 - Lecture 2 Lecture 2 Reflection and Refraction,...

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Lecture 2 1 © Jeffrey Bokor, 2000, all rights reserved Lecture 2 Reflection and Refraction, Snell’s Law [Reading assignment: Hecht 4.3, 4.4, 4.7] An important element of optics is the interface between 2 materials with different index of refraction Total Reflection If , then we can have The refracted ray disappears! The light is totally reflected. This usually occurs inside a prism , and is called total internal reflection. = “critical angle”. For a typical glass with , the critical angle is: . reflected ray refracted ray 2 1 1 n 2 n 1 n 1 1 n 2 2 sin = sin 1 sin 2 sin ------------- n 2 n 1 ----- if n 2 n 1  2 1 if n 1 n 2 2 1 = n 1 n 2 2 90 = 2 90 = c sin n 2 n 1 = 1 c sin 1 n 2 n 1  = c n 1.5 = sin 1 1 1.5 ------   41.8 =
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Lecture 2 2 © Jeffrey Bokor, 2000, all rights reserved So for , the light is reflected. A very common prism is the right angle prism Light Impinging at a Surface The plane containing the light ray propagation vector and the surface normal is called the “plane of inci- dence For a general polarization state incident on a surface, we choose s and p directions to decompose the polarization effects.
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Lecture 2 - Lecture 2 Lecture 2 Reflection and Refraction,...

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