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Unformatted text preview: Light Waves A soap bubble appears iridescent in white light when the thickness of the soap film is about the same as a wavelength of light. Bright fringes occur when waves (from both slits) arrive in phase; dark areas result from the overlapping of waves that are out of phase. Diffraction grating disperses white light into colors, and are used in spectrometers. The amount of diffraction depends on the wavelength of the wave compared to the size of the obstruction that casts the shadow. The longer the wave compared to the obstruction, the more the diffraction occurs. Terms: Huygens principle: the theory by which light waves spreading out from a point source can be regarded as the superposition of tiny secondary wavelets. Diffraction: the bending of light around an obstacle or through a narrow slit in such a way that fringes of light and dark or colored bands are produced....
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