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# summary17 - Summary Lecture 17 Wavefronts and Snells Law of...

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Summary Lecture 17 Wavefronts and Snell’s Law of Refraction Smaller velocity Wavefronts closer together Change in direction

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Refraction Medium 1 (n Normal 1 1 ) Medium 2 (n 2 ) 2 Caused by the difference in the speed of light in medium 1 and 2 Index of Refraction n = c/v (n air ~ 1, n Water = 1.33 …) Snell’s Law of Refraction n 1 sin 1 = n 2 sin 2
Example A ray of light passes from air (n = 1.0) into glass (n = 1.52) and then into Jell-O. The incident ray makes a 58 0 o angle The incident ray makes a 58.0 angle with the normal as it enters the glass and a 36.4 o angle with the normal in Jell-O. What is the index of refraction in Jell-O? Glass Jell-O 58.0 o 36.4 o

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Total Internal Reflection going from a medium with large n to a medium with small n “refracted” away from normal 1 2 3 n 2 4 c n 1 Critical Angle: sin =n /n Critical Angle: sin C = n 2 /n 1 Total Internal Reflection > C
Lenses Lenses

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summary17 - Summary Lecture 17 Wavefronts and Snells Law of...

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