Question

Let the intensity on the screen at a point P in a double slit interference pattern be 60.0% of the maximum value

(a)  What is the minimum phase difference (in radians) between sources?

(b)  In (a), what is the corresponding path difference if the wavelength of light is λ = 500 nm? 

Answer 1

 (a) The intensity

(b) The phase difference δ is related to the path differenceΔ and the wavelength λ by