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# db_lec16_post - PHYS 221 Last lecture Dispersion...

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PHYS 221 Lecture 16 3/6/12 D. Bortoletto PHYS221 1 • Last lecture – Dispersion – Polarization • This lecture – Geometrical optics – Reflection, refraction – Dispersion

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Propagation of Light: Fermat’s Principle The path taken by light traveling from one point to another is such that the time of travel is a minimum. constant speed: minimize distance traveled. two different speeds: minimize distance traveled at the slower speed. 3/6/12 2 D. Bortoletto PHYS221
3/6/12 3 Geometric Optics Material 1 Material 2 incident ray reflected ray refracted ray •Waves whose λ << than the objects with which it interacts. •Assume light propagates in a straight line (rays) D. Bortoletto PHYS221

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3/6/12 4 Reflection θ i θ r θ i -angle of incidence θ r - angle of reflection All measured relative to the normal to the interface. D. Bortoletto PHYS221 · Why? – Justification: when surface is a good conductor electric field lines are perpendicular to the conductor surface The components of E parallel to the surface of the incident and reflected wave must cancel!! ir θθ =
Objects and images 3/6/12 D. Bortoletto PHYS221 5 Object: • Light reflects off an object and rays go off in all directions • Some rays travel to observer and are “processed” by her or him

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3/6/12 6 Types of Images •Virtual Images • Images that are formed behind the mirror, where light
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## This note was uploaded on 03/20/2012 for the course PHY 221 taught by Professor Moffet,thomasj.–bortoletto,daniela during the Spring '12 term at Purdue.

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db_lec16_post - PHYS 221 Last lecture Dispersion...

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