Lecture 25

# Lecture 25 - Refraction When light passes from one...

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Refraction When light passes from one transparent material to another, several things happen: 1. The light changes direction. 2. The light changes speed (!) 3. The light changes wavelength, but not frequency. 4. The light changes in intensity (some is always reflected).

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Index of refraction All these effects turn out to hinge on two numbers, the indexes of refraction , n 1 , n 2 of the two transparent media 1. Directional behavior is given by Snell’s Law : n 1 sin θ 1 =n 2 sin θ 2 , where θ 1 and θ 2 are the incident and refracted angles. . 2. The speed of light within medium i is v i =c/n i . 3. Because f stays the same, the wavelength in medium i is λ i =n ι λ , where λ is the wavelength in free space. 4. Two angles produce very interesting effects: total transmission of one polarization state and total internal reflection.
Tables of n Vacuum 1.00000 Air at STP 1.00029 Ice 1.31 Water at 20 C 1.33 Acetone 1.36 Ethyl alcohol 1.36 Sugar solution(30%) 1.38 Fluorite 1.433 Fused quartz 1.46 Glycerine 1.473 Sugar solution (80%)

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## This note was uploaded on 05/11/2010 for the course ＰＨＹ 214 taught by Professor Timothybolton during the Spring '10 term at Kansas State University.

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Lecture 25 - Refraction When light passes from one...

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