Physics 221Physics 221Spring 2012

Note: The exam dates for the three exams were incorrect on theexams were incorrect on the presentation and syllabus distributed earlier.earlier. Exam I will be Thursday February 23. Exam II will be Thursday March 29Exam II will be Thursday March 29. Exam III will be Thursday April 26.

January 19, 2012 Physics 221 1

Light and Optics

Jan. 17 – 20 33 The Nature and Propagation of LightJan. 23 – 27 34 Geometric OpticsJan 30 Feb 3 35 InterferenceJan. 30 – Feb. 3 35 InterferenceFeb. 13 – 17 36 Interference / DiffractionFeb. 20 – 24 36 DiffractionThursday, February 23 33-36 Exam I

January 19, 2012 Physics 221 2

Oscillations and Waves

Feb. 27 – Mar. 2 13 Periodic MotionMar. 5 – 9 15 Mechanical WavesMar 12 16 Spring BreakMar. 12 – 16 Spring BreakMar. 19 – 23 16 Sound and HearingMar. 26 – 30 16 Doppler EffectThursday, March 29 13, 15-16 Exam II

January 19, 2012 Physics 221 3

Thermal Physics

Apr. 2 – 6 17 Temperature and HeatApr. 9 – 13 18 Thermal Properties of MatterApr 16 20 19 The First Law of ThermodynamicsApr. 16 – 20 19 The First Law of ThermodynamicsApr. 23 – 27 20 The Second Law of ThermodynamicsThursday, April 26 17-20 Exam III

January 19, 2012 Physics 221 4

The Nature and Propagation p gof Light (continued)(continued)

Chapter 33January 19, 2012January 19, 2012

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January 19, 2012 Physics 221 8

Refraction at an interfaceRefraction at an interface

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Consequences of refractionConsequences of refraction

January 19, 2012 Physics 221 10

Refraction, an example.

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The SolutionThe Solution

January 19, 2012 Physics 221 12

Dispersion of LightDispersion of Light

January 19, 2012 Physics 221 13

Why prisms behave as they do.

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T t l I t l R fl tiTotal Internal Reflection

Going from an optically more “dense” medium

The “critical angle” is defined as the angle when TIR begins.

to a less “dense” medium.N2 < N1

January 19, 2012 Physics 221 15

Principle behind optical fibers

Inside higher index of refraction

Outside lower index of refraction

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Outside lower index of refraction (usually there are multiple coatings around fiber to insure this).

January 19, 2012 Physics 221 17

Polarization of lightPolarization of light

The polarization direction for light is the direction of the Electric field vector in the EM wave.vector in the EM wave.

January 19, 2012 Physics 221 18

Polarizing Light with filtersPolarizing Light with filters

January 19, 2012 Physics 221 19

Polarization of scattered lightg

January 19, 2012 Physics 221 20

Brewster’s angleBrewster s angle

January 19, 2012 Physics 221 21

Huygen’s PrincipleHuygen s Principle

Every point on a wave front is a secondary source for waves that traveluniformly in all directions with a speed of propagation equal to the speed of the original wave frontoriginal wave front.

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