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17) What should be the thickness of a layer of MgF2 applied on the glass surface...

17) What should be the thickness of a layer of MgF2 applied on the glass surface of a window, to eliminate the reflection of light that has a wavelength in air of 630nm. The light is incident perpendicular to the MgF2 layer.
n glass = 1.62, nMgF2 = 1.27
(a) 315nm (b) 157nm (c) 389nm (d) 97nm (e) 124nm
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