L26Note_TotalInternalReflection(9)

# L26Note_TotalInternalReflection(9) - Quiz 6 8:10 AM Law of...

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1 1 PHYS 112, SP08, Cui Lecture 26, 04/16/08 Quiz 6 @ 8:10 AM Academic Integrity QUIZ and EXAM : individual work, no cell phone, no programmable calculator, no small talk, no look over shoulder… You know from your heart what are the right/wrong behaviors! 2 PHYS 112, SP08, Cui Lecture 26, 04/16/08 Law of Refraction 2 2 1 1 sin sin θ n n = Snell’s Law of Refraction Angle of incidence Angle of refraction Normal! 1 n 2 n 3 PHYS 112, SP08, Cui Lecture 26, 04/16/08 Total Internal Reflection What is θ 2 , when n 1 =1.6, n 2 =1.0, θ 1 =45 0 ? 2 2 1 1 sin sin n n = When light travels from _______________ to a ___________________ (e.g. from water to air), if it strikes such that the angle with the perpendicular is__________ than a certain critical angle , it ______________________ , rather it is reflected back into the water. The critical angle ( θ c ) is reached when ____________ 4 PHYS 112, SP08, Cui Lecture 26, 04/16/08 Fiber Optics • An application of total internal reflection. • Plastic or glass rods are used to “pipe” light from one place to another. • Applications include – medical use of fiber optic cables for diagnosis and correction of medical problems. – Telecommunications.

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L26Note_TotalInternalReflection(9) - Quiz 6 8:10 AM Law of...

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