Question: Why thin film on a glass surface can remove completely reflections at certain light wavelength? Magnesium fluoride (n = 1.38) is used as coating on

  1. Why thin film on a glass surface can remove completely reflections at certain light wavelength?
  2. Magnesium fluoride (n = 1.38) is used as coating on nonreflecting glass. How thin coating is enough to remove reflections completely perpendicularly arriving light with wavelength 550 nm in air?
  3. How would this coating remove reflections of light with 450 nm and 650 nm in air?

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