Ashish Kumar
Last Activity: 11 Years ago
Intensity at a point = 4 I (cos A/2)^2 , where I is the intensity due a single slit and A is the phase difference between the light coming from the two slits.
given , 4 I (cos A/2)^2 / 4I =.853
cos A/2=.9235, A= 0.786 rad.
path difference = lambda* A /(2* pi) = 0.125 lambda (lambda =wavelength)
