PHYS 101 Lecture Notes - Public Address System, Electric Field, Total Internal Reflection

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PHYS 101 Full Course Notes
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PHYS 101 Full Course Notes
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The bright fringes are more closely spaces than in air. Example: a think piece of glass is placed in front of one of the two slits in a young"s experiment so that the two waves arrive at the slit 180 degrees out of phase. In the two slit experiment, the waves emitted are coherent (both sources emit a wave crest at that instant) this has a well-defined phase and wavelength relationship that gives us interference. In general, multiple light sources give incoherent light and they have no fixed phase relationship to another and therefore we do not get interference in real life. The spreading of white light into a spectrum is often called dispersion. Most prisms also give a rainbow spectrum because the index of refraction is a function of the wavelength varying by several percent over the range of visible light. The second rainbow is cause by double reflections inside the raindrops.

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