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What theoretical ratio of high-to-low refractive indices is needed to give at least 90% reflectance in a high-re- flectance stack of two double layers of quarter-wave layers at normal incidence? Assume a substrate of index 1.52.

What theoretical ratio of high-to-low refractive indices is needed to give at least 90% reflectance in a high-re- flectance stack of two double layers of quarter-wave layers at normal incidence? Assume a substrate of index 1.52.

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15 What theoretical ratio of high-to-low refractive indices is needed to give at least 90% reflectance in a high-re- flectance stack of two double layers of quarter-wave layers at normal incidence? Assume a substrate of index 1.52.
Transcribed Image Text:15 What theoretical ratio of high-to-low refractive indices is needed to give at least 90% reflectance in a high-re- flectance stack of two double layers of quarter-wave layers at normal incidence? Assume a substrate of index 1.52.
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