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Physics Online
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Waves - Young's double slit experiment
This video explains the observations when two coherent light waves interact to form fringes. A diagram is used to show that
λ = (ax)/d, where a = slit separation and D = the distance between the slit and the projection screen, and x = distance between fringes. From these measurements Young was able to determine the wavelength of light.
The final part of the video shows how Young produced a coherent light source for this experiment.
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