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Introductory Physics Homework Help
Double-Slit+ Glass Refraction
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[QUOTE="Simon Bridge, post: 4804898, member: 367532"] Basically the text does not use Snells law because it has no effect on the outcome (well, any effect is smaller than the approximations already being used). Recall that the two sides of the glass are parallel - so rays emerge at the same angle as the incident rays. The effect, therefore, is to displace the ray by a distance that depends on the thickness of the glass, making the slits appear closer together ... but you are told that the glass is [i]very thin[/i], so the displacement will be very small. You can check this for yourself: Repeat the calculation, taking snell's law into account, and see what difference it makes for glass thickness t and refractive index n. Then see what happens when you make the thickness very small compared with the other dimensions of the experiment. The calculation already involves approximations, this one is small compared to the others. [/QUOTE]
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Double-Slit+ Glass Refraction
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