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Suppose you have a lens system that is to be used primarily for 690-nm light. What is the second thinnest coating of fluorite
(calcium fluoride) that would be non-reflective for this wavelength?
nm

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Suppose you have a lens system that is to be used primarily for 719-nm red light. What is the second thinnest coating of fluorite (magnesium fluoride, n=1.413) that would be nonreflective for this wavelength (in nm)? Round your answer to 0 decimal places.
Suppose you have a lens system that is to be used primarily for 700-nm red light. What is the second thinnest coating of fluorite (magnesium fluoride) that would be non-reflective for this wavelength?
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