Question: Sometimes thin films are used as filters to prevent certain colors from entering a lens. Suppose an infrared filter is to be designed to prevent

Sometimes thin films are used as filters to prevent certain colors from entering a lens. Suppose an infrared filter is to be designed to prevent 800.0-nm light from entering a lens. Find the minimum thickness for a film of MgF2 (n = 1.38) that will prevent this light from entering the lens.

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