S10P1CLec22C

S10P1CLec22C - Physics 1C Lecture 22C "If you want the...

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Unformatted text preview: Physics 1C Lecture 22C "If you want the rainbow, you gotta put up with the rain."--Dolly Parton Dispersion The index of refraction in anything except a vacuum depends on the wavelength of the light. The dependence of n on is called dispersion. Snells Law indicates that the angle of refraction made when light enters a material depends on the wavelength of the light. The index of refraction for a material usually decreases with increasing wavelength. Dispersion This means that violet light refracts more than red light when passing from air into a material. The amount the ray is bent away from its original direction is called the angle of deviation, . Since all the colors have different angles of deviation, they will spread out into a spectrum. Violet deviates the most. Red deviates the least. Rainbows Rainbows appear when a ray of light strikes a drop of water in the atmosphere. The incident white light ray will undergo both reFection and refraction. At the rst boundary (air- water), refraction will occur (with red deviating the least). At the second boundary (water-air), reFection will occur. It refracts again as it hits a third boundary (water-air). Rainbows The angle between the incident white light and the violet ray is 40 o . The angle between the incident white light and the red ray is 42 o . All of the other visible colors will lie in between violet and red....
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This note was uploaded on 06/03/2010 for the course PHYS PHYS 1C taught by Professor F during the Spring '00 term at UCSD.

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S10P1CLec22C - Physics 1C Lecture 22C "If you want the...

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