UCSD PHYS 10 - Natural Light Phenomena (3 pages)

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Natural Light Phenomena



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Natural Light Phenomena

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Lecture Notes


Pages:
3
School:
University of California, San Diego
Course:
Phys 10 - Concepts in Physics

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Natural Light Phenomena 6 02 08 Physics 10 UCSD Physics 10 UCSD Why is the sky blue Blue light more readily scattered scattered by air molecules called Rayleigh Scattering strong function of wavelength blue light in sky has been diverted from some other path with some blue light missing sun looks yellow orange Natural Light The Natural Appearance of Things Spring 2008 Physics 10 UCSD 2 Physics 10 UCSD The spectrum of the blue sky Is the night sky blue too The sky blue curve has a spectrum that gets steeper and steeper towards the blue violet end of the visible spectrum You bet Just too dim to perceive time exposure at night under moonlight shows this Shown on top of the blue curve is a model that goes according to theory 1 4 The orange curve is the spectrum of a white piece of paper in the sun Spring 2008 Lecture 21 3 You can find blue from scattering in other circumstances as well water glaciers astrophysical reflection nebulae Spring 2008 4 1 Natural Light Phenomena 6 02 08 Physics 10 UCSD Physics 10 UCSD Rainbows Halos Sun dogs and More More Rainbows come in pairs pairs Rainbows come from the interaction of sunlight with round water droplets preferred single reflection path with 42 deflection angle see http mysite verizon net vzeoacw1 rainbow html drag incoming ray and you get a stationary behavior at 42 rainbow arc always centered on anti solar point different colors refract at slightly different angles Secondary rainbow has two reflections Red now appears lower than blue in the sky owes to differences in refractive index for different colors Area between rainbows often seen to be darker than elsewhere Beautiful double rainbow in Zion National Park The primary is brighter and the color sequence is reversed from that seen in fainter secondary single bounce red blue paths different Spring 2008 red appears higher in sky than blue 5 Physics 10 UCSD Note rainbow can exist in foreground Spring 2008 6 Physics 10 UCSD The halo and sun dogs Questions Which general



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