Refraction 14.3Now Is The TimeWhat do I owe YOU?Getting There Fast Are you studying for the final yet??Refraction and related topicsThe speed of lightIndex of RefractionNoticeHuygen’s PrincipleSlide 10Slide 11Slide 12Some GeometrySlide 14Snell’s Law of RefractionBoth TogetherSlide 17Slide 18Total Reflection – Optical FiberSlide 20dichroismSlide 22Slide 23Let’s do some problems if we have sufficient time….Almost There!Turn in Unit 16 Unit 16 for GradingExam-3Exam-3Working very hard on this but am being careful. I Working very hard on this but am being careful. I stopped to put this presentation together but I stopped to put this presentation together but I might get it done. Or not. Will be reviewed when might get it done. Or not. Will be reviewed when returned.returned.Lab reportsLab reportsTold you about these last timeTold you about these last timeAssorted small stufAssorted small stufAll papers will be returned either Monday or at All papers will be returned either Monday or at the final exam. All grades will have been the final exam. All grades will have been updated.updated.Clicker GradesClicker GradesSome time this week via posted file with messed Some time this week via posted file with messed up PIDs.up PIDs.4Sunday Monday TuesdayWednesdayThursday Friday Saturday1 23 4 Complete Induction5 6AC7 8ACQuiz?910 11COMPLETEAC EXPT12 13 OPTICSEM WavesPOLARIZATION14 15 OPTICSQuiz1617 18EXAM #3(No Optics)19 20 OPTICS21 22 OPTICS2324 25 (LAST LASS)OPTICSPOST POST TESTTEST26 27 28 29 30 FINALHPA 1199:00 AM6Light travel’s at a speed c in a vacuum.In an actual material, it travels a bit slower, at a velocity of v.The speed of light depends on the material through which it is traveling.DEFINITION – INDEX OF REFRACTION (or refractive index):1mediumnt transparaain light ofvelocity vacuumain light ofvelocity n78Noticevacuumfcfcnfvvcn1For two materials12212211nndividennvacuumvacuumHuygen’s Principle9Each point on a wavefront actsas a secondary source of sphericalwaves that progress from thesource at the speed of light (whateverit may be).A spherical wave with very large radius,behaves as a plane wave.10Far, far awayPHY10211.Not there yet!12The Wave Nature of LightThe law of refraction is explained by Huygen’s PrincipleThe little wavelets move slower in medium 2 than in medium 1. Doing the tangent shows how the wave fronts bend.Some Geometry1300909014The Wave Nature of LightADC 2 BAD 1sin1v1tAD and sin2v2tAD2112121212221112212121//sinsin//sinsinnnncncvvtvtvnnnnncncvvIf medium 1 is air, thenn11 and v1c and 1n/nSnell’s Law of Refraction152211sinsinnn Law of Reflection21Both Together161718abcriticalbbcriticalaabnnSinnnSinnnn)90sin(0At the critical angle andbeyond, only reflection ispossible.Total Reflection – Optical Fiber1920Waves on a string.dichroism2180%1% of opposite polarization2223Let’s do some problems if we have sufficient time….•No, this is NOT a test!•Follow the instructions on first page.•Do the other problems at
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