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Lecture 24

# Lecture 24 - The End Game Quiz 5 comes quickly a week from...

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The End Game Quiz 5 comes quickly, a week from this Friday, April 29 at 4:30 PM. We will have an Evaluated Review Session, an optional scantron only exercise on Friday, May 6 at 4:30 PM that can replace one of your two lowest quiz scores. The final exam is Friday, May 13 at 7:30AM. Remain topics: for Quiz 5, geometric optics; for the last week, interference and diffraction.

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Scattering of Light Recall that to see something, light must scatter from that object into your eyes. Light can essentially scatter in four ways: – Reflection (today): it bounces off an object. Everything reflects. Metals reflect almost perfectly. – Refraction: light changes direction as it passes from one transparent material to another. Transparent materials doe not exhibit significant – Absorption: the transfer of energy in the EM wave to atoms making up the substance. – Diffraction: light bends around objects.
Rayleigh Scattering This process describes scattering at the atomic level. The probability for light to scatter depends strongly on λ . This is why the sky is blue during the day and red towards the horizon at sunlight.

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The Law of reflection Reflection changes the direction (the k-vector) of propagation of EM and possibly the amplitude, leaving the frequency (color) unaffected. We use the work “ray” as shorthand for “direction of propagation”.
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