8.snell- assignment

# 8.snell- assignment - Two derivations of Snells Law In Phys...

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Two derivations of Snells Law In Phys 220 we are representing the light as rays - straight lines. We know that light is actually a wave We can think of this rather like a water wave - these are the ripples set up by a dripping faucet - expanding out into a pond. Very far from the faucet the wave is almost flat This flat part is called the wave front. If we were to cut perpendicular to the wave front, we would see the wave So we have three ways of reprsenting the wave: a wave front - a line tangent to the crests a ray - a line perpendicular to the wave front the wave Now suppose we go very far from the source - the wave fronts would be parallel to each other and separated from each other by one wavelength. Now suppose we had some light moving in a medium with an index of refraction n 1 and it falls on the surface of another medium with an index of

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refraction n 2 where n 2 > n 1 . This means that the speed of light in medium 2 is LESS than in medium 1.
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