OPTI 201R 10 L34 - 34-1 The Primary Rainbow OPTI 201R Fall...

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OPTI 201R Fall 2010 34-1 The Primary Rainbow
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OPTI 201R Fall 2010 34-2 Characteristics: ! The colors are caused by dispersion within water drops. ! Rays from the sun are refracted into the droplet (dispersion)… ! These rays are reflected at the back surface of the droplet… ! These rays are refracted back out of the droplet (dispersion) to the observer's eyes. ! Rays at a specific color (wavelength) reach the observer's eyes at a constant angle ! Therefore, a circular "bow" is formed of all colors. ! The center of the circular bow is found on the line that connects the sun with the observer's eyes. - To see rainbow in the east, the sun must be in the west. - To see rainbow in the west, the sun must be in the east. - "A rainbow is never observed at noon." (when the sun is directly overhead) - To see the full circular rainbow, you must be up in the air. (from an airplane, or a skyscraper!!)
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OPTI 201R Fall 2010 34-3 Figure C.1 Sun-observer orientation forming an optical axis.
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This note was uploaded on 08/23/2010 for the course OPTICS 201R taught by Professor Staff during the Spring '10 term at University of Arizona- Tucson.

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OPTI 201R 10 L34 - 34-1 The Primary Rainbow OPTI 201R Fall...

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