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The two reflected rays may or may not be in phase it

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Unformatted text preview: rence The thin film effect refers to colors seen in such things as soap bubbles and oil spills. It occurs as a result of the constructive and destructive interference of light waves, not because of refraction as in a prism. When light hits a bubble, some of it is reflected by the outer (air-soap) interface (ray #1), while some penetrates the bubble wall and is reflected by the inner (soap-air) interface (ray #2). The two reflected rays interfere with one another. Typically, most wavelengths will be out of Guinness Soap Bubble Records phase since #2 has to travel a greater distance than #1. However, one wavelength will be in incident ray phase and this corresponds to the color produced. The color depends on how great the difference in #1 distance is that the two rays travel, and this distance #2 depends on bubble thickness. The variations in reflected thickness (thinner at the top, thicker at the bottom) rays are responsible for the different colors. Continued on Next Soap Bubble Wall Thin Films (cont.) When light moving through the air encounter...
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