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A glass lens is coated on one side with a thin film of magnesium fluoride (MgF2)...

A glass lens is coated on one side with a thin film of magnesium fluoride (MgF2) in order to reduce reflection from the lens surface. The index of refraction of MgF2 is 1.42; that of the glass the lens is made out of is 1.50. What is the least thickness for the coating that eliminates the reflections of light that is in the middle of the visible spectrum (wavelength 550 nm)?

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