三光强分布(振幅矢量法) Ep=2Rsin(4@/2), AE B AE0=2RSinAo/2), →Ep=∠ E sIn(A④/2) sin(Ao/2) N→ 'P=F Sin(Ap /2) S=4. sin 6 E Aq=2丌(6/ A(/2 sin(φ/2 →Ep=NAE0M/2 A④ E →Eb=E sin(φ/2) A④/2 R →E,=E sin(asin g /n) na sing/n sin(asin g/n msin/1→明暗纹位置E0 p  = l sin  = 2( / ) f  x a  A B C 0 *三.光强分布(振幅矢量法) l = a / N E 2Rsin( / 2) , P = 2 sin( / 2) , E0 = R  , sin( / 2) sin( / 2) 0     EP = E , / 2 sin( / 2) 0     N  EP = N E , / 2 sin( / 2) 0      EP = E ; sin / sin( sin / ) 0       a a  EP = E  R  E0  EP 2 0 ] sin / sin( sin / ) [       a a I I  P =  明暗纹位置 , / 2 sin( / 2) 0    EP E N ⎯⎯⎯→ = →