Chapter19b

# Chapter19b - Atmospheric Optics - II RECAP Hum a np e rc e...

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Atmospheric Optics - II

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RECAP Hum a n pe rc e ptio n o f  c o lo r,  white  o b je c ts , blac k o bje c ts . Light scattering:  light is sent in all directions –forward, sideways and backward Geometric scattering:  R>> λ (all wavelengths equally scattered)  Mie scattering:  R~ λ (red is scattered more efficiently) Rayleigh scattering:  R<< λ (blue is scattered more efficiently) Phenomena: white clouds, blue skies, hazy skies, crepuscular rays, colorful sunsets, blue moon. Refraction : the bending of the light ray as it travels from one medium to another. It bends  towards  the vertical if it enters a more-dense medium and  away  from the vertical as it enters a less-dense  medium.  Phenomena: stars appear higher in the sky, twinkling, twilight. Reflection : the angle of incidence is equal to the angle of reflection TODAY:
Reflection and Refraction of Light The speed of light in vacuum is  c=300,000 km/s Snell’s law : The angle of incidence is  equal to the angle of reflection. Light that  enters  a more-dense  medium  slows down and bends  toward  the  normal. Light that  exits   a more-dense  medium  speeds up and bends  away  from the  normal.

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Due to the refraction of light the  objects on the sky appear higher  than they actually are. Star location and scintillations;
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## This note was uploaded on 01/26/2012 for the course MET 1010 taught by Professor Matchev during the Spring '08 term at University of Florida.

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Chapter19b - Atmospheric Optics - II RECAP Hum a np e rc e...

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