光的干涉应用举例精1简要回顾n 干涉条件（充分条件；必要条件）n 相干和不相干n 相干光源与不相干光源n 杨氏双缝干涉n 薄膜干涉（等倾干涉、等厚干涉）精2Light beams can interfere with each other: Two point sourcesDifferentseparations.Notethedifferentpatterns.Constructivevs.destructiveinterference精3Constructive vs. destructive interference;Coherent vs. incoherent interferenceWavesthatcombinein phaseadduptorelativelyhighirradiance.Wavesthatcombine180 out of phasecanceloutandyieldzeroirradiance.Wavesthatcombinewithlots of different phasesnearlycanceloutandyieldverylowirra
