P219lecture15light

# P219lecture15light - Goal To understand light Objectives 1...

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Goal: To understand light Objectives: 1) To understand how matter affects the speed of light 2) To learn why the Summer is hotter than the winter 3) To learn about Polarization 4) To understand and be able to calculate Doppler effect on light

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Speed of light in matter In matter light is slowed. The fraction it is slowed is called the index of refraction (n) n = c / v where v is the velocity of light in that material and c is the speed of light in a vacuum. And good to know that v = λf Quick sample: If the speed of light in a fluid is half the speed of light in a vacuum then what is the index of refraction for that material?
Why are summers hotter than winters?

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Polarization A light photon is a 2 dimensional wave (i.e. a wave in a 2 dimensional plane) with some velocity in some direction. Usually each photon will come in at some random plane. This is unpolarized light. However, if the light is emitted preferentially in some plane, or is forced into it, then it will become polarized.
Linear polarization One way to polarize light is linearly.

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