chp41_8 - Sunlight falls almost perpendicularly on the film...

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PHY2061 R. D. Field Department of Physics chp41_8.doc University of Florida Interference Problems Double Slit Example: Red light ( λ = 664 nm ) is used with slits separated by d = 1.2x10 -4 m . The screen is located a distance from the slits given by L = 2.75 m . Find the distance y on the screen between the central bright fringe and the third- order bright fringe . Answer: y = 0.0456 m Thin Film Example: A thin film of gasoline floats on a puddle of water.
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Unformatted text preview: Sunlight falls almost perpendicularly on the film and reflects into your eyes. Although the sunlight is white, since it contains all colors, the film has a yellow hue, because destructive interference has occurred eliminating the color of blue ( = 469 nm ) from the reflected light. If n gas = 1.4 and n water = 1.33 , determine the minimum thickness of the film . Answer: T min = 168 nm...
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This note was uploaded on 05/31/2011 for the course PHY 2061 taught by Professor Fry during the Spring '08 term at University of Florida.

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