37CHAPTER OUTLINE37.1Conditions for Interference37.2Young’s Double-Slit Experiment37.3Intensity Distribution of theDouble-Slit InterferencePattern37.4Phasor Addition of Waves37.5Change of Phase Due toReflection37.6Interference in Thin Films37.7The MichelsonInterferometerInterference of Light WavesANSWERS TO QUESTIONSQ37.1(a)Two waves interfere constructively if their pathdifference is zero, or an integral multiple of thewavelength, according to δλ=m, withm=0123,,,,….(b)Two waves interfere destructively if their pathdifference is a half wavelength, or an odd multiple ofλ2, described by δλ=+FHGIKJm12, with m=0123,,,,….Q37.2The light from the flashlights consists of many differentwavelengths (that’s why it’s white) with random timedifferences between the light waves. There is no coherencebetween the two sources. The light from the two flashlightsdoes not maintain a constant phase relationship over time.
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