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A double slit interference experiment shows fringes on a screen. If this entire experiment were interested...

  1. A double slit interference experiment shows fringes on a screen. If this entire experiment were interested in water then would the fringes get closer together, farther apart, stay the same, or disappear altogether? Explain your reasoning.
  2. Antireflection coatings for glass usually have an index of refraction that is less than that of glass. Explain why this would give a thinner coat?
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Answer #1

Because the tarnish has a refractive index between those of glass and air, each of these interfaces exhibits less reflection than the air-glass interface did. In fact, the total of the two reflections is less than that of the "naked" air-glass interface, as can be calculated from the Fresnel equations.

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