Question a film is coated on the surface of a lens, Ask an Expert

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Question: A film is coated on the surface of a lens maximizing transmission at ? = 600 nm. If the index of refraction of the film is 1.4 (which is lower than the index of refraction of the glass),

Part A- What is the thickness of the film (in nm)?

I just want the right answer, Thanks! Hint: maximum transmission occurs when reflection is at a minimum?

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