Intensity of Interference Pattern

• Amplitude of electric field at P is 2Emcos(?)= 2Emcos(?d sin?/?)

• intensity of field ? the amplitude squared

• I = I0 cos2 (?d sin?/?) where I0 =4(Em)2

• I = I0 when ? =m? => d sin?=m?

• I = 0 when ? = (m+1/2)? => d sin?=(m+1/2)?

• I = I0 cos2 (?) with ? = ?d sin?/?

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