An anti-reflection coating is to be applied to the surface of a camera lens made from glass of index 1.50. Some MgF 2 is available with a refractive index of 1.38. What physical thickness of material should be applied to the lens to work in visible light?

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An anti-reflection coating is to be applied to the surface of a camera lens made from glass of index
1.50. Some MgF
2
is available with a refractive index of 1.38. What physical thickness of material should be
applied to the lens to work in visible light?
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