Wave Optics31724.26With a phase reversal due to reflection at each surface of the magnesium fluoride layer, there is zero net phase difference caused by reflections. The condition for destructive interference is then 11222nfilmtmmnλ=+, where 0, 1, 2,m=…For minimum thickness, , and the thickness is 0m=()( )955010m21m99.6nm44 1.38filmn−×=89.9610−=×1=24.27There is a phase reversal upon reflection at each surface of the film and hence zero net phase difference due to reflections. The requirement for constructive interference in the
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