Chapter19b - Atmospheric Optics - II RECAP Human perception...

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Atmospheric Optics - II
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RECAP Human perception of color, white objects, black objects. 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 Total internal reflection : mirages Dispersion : separation of colors when light travels through a medium. rainbow TODAY:
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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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True and apparent position of objects Due to the refraction of light the
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Chapter19b - Atmospheric Optics - II RECAP Human perception...

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