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Hubungan dispersi:eiKΛ=12( A+D)±14( A +D)2imajiner− 1cosKΛ =12( A+D)=cosk1xd1cosk2 xd2−12⎛⎜⎝kk2 x1x+kk1x2 x⎞⎟sin⎠k1xd1sink2 xd2kix2⎛ niω⎞ 2 niω= ⎜ ⎟ − β = cos θi;i⎝ c ⎠ c= 1,2Harga cos KΛ ditentukan oleh ω dan β. Kurva ω vs βdisebut kurva dispersi.73