[问答题]
What is the index of refractiony/55g ddfj9 zg of a clear material if a minimum of 1qmx(ag/m xc9;:fg ki 650 nm thickness of it, when laid on glass, is needed to reduce reflection to nixgc(g/x6a km 9mfq ;:early zero when light of 600 nm is incident normally upon it? Do you have a choice for an answer?
