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A piece of glass is completely surrounded by air. It has a thickness of 300nm. A...

A piece of glass is completely surrounded by air. It has a thickness of 300nm. A white light shines on the glass and we see a green light of wavelength 520nm reflects strongly from the surface of the glass. what is the index of reflection of the glass? (It should be between 1 and 2.)
Science   Advanced-Physics   
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