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White light is shone on a very thin layer of mica (n = 1.57) that is...

White light is shone on a very thin layer of mica (n = 1.57) that is surrounded by air (n = 1.00) above the film and the film rests on a material with index n = 1.80. Above the layer of mica, interference maxima for two wavelengths (and no others in between) are seen; one blue wavelength of 480 nm, and one yellow wavelength of 560 nm.

  1. What is the thickness of the mica layer?
  2. If the thickness of the mica layer were doubled, what are the largest and smallest visible wavelengths observed in the reflected light?
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