336CHAPTER 24 24.71The refractive index, n, of the wedge material is greater than that of the surrounding air. Thus, when illuminated from above, light reflecting from the upper surface of the wedge experiences a 180° phase shift while light reflecting from the bottom surface experiences no shift. The condition for constructive interference of light reflecting from the thin film of transparent material is then 122ntmλ=+where m0, 1, 2,=…and the condition for destructive interference is 2ntm=where mThe thickness, t, at distance xfrom the edge of the wedge is found using the similar
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