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A thin film of alcohol (n = 36) lies on a flat glass plate (n =...

  1. A thin film of alcohol (n = 36) lies on a flat glass plate (n = 51). Light whose wavelength can be changed is incident normally on the alcohol. The reflected light is a minimum for l = 512 nm and maximum for l = 640 nm. What is the minimum thickness of the film?

  1. 235 nm
  2. 94 nm
  3. 1412 nm
  4. None of the above
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