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you have a lens system that is to be used primarily for 675 nm red light....

you have a lens system that is to be used primarily for 675 nm red light.

Magnesium fluorite index of refraction = n = 1.38

Second thinnest coating of magnesium fluorite that would be non-reflective for this wavelength = t = 366.8 nM Assuming the index of refraction of the lens is bigger than 1.38.

Draw a diagram of the mediums showing where, if any, a phase change occurs. State whether you are looking for constructive of destructive interference.

Science   Advanced-Physics   
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