destructive interference occurs at 0.5(lambda), (3/2)(lambda),...
The Attempt at a Solution
I found the path difference to be:
and this has to be equal to (n)(lambda)/2 where n is an odd integer for destructive interference
this does not work out algebraically for me...as the x^2-x^2=0
is this path difference not correct?
do I just use f(n)=(nv)/(2d) to find d?