ch35-p039 - 39. For complete destructive interference, we...

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39. For complete destructive interference, we want the waves reflected from the front and back of the coating to differ in phase by an odd multiple of π rad. Each wave is incident on a medium of higher index of refraction from a medium of lower index, so both suffer phase changes of π rad on reflection. If L is the thickness of the coating, the wave reflected from the back surface travels a distance 2 L farther than the wave reflected from the front. The phase difference is 2 L (2 π
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