A square has sides of length L. In the lower-right and lower-left corners there are two sources of light waves, one in each corner, that emit identical in-phase light waves of wavelength 8.28 m in all directions. What is the minimum value of L such that constructive interference occurs in the upper-right corner? Ignore any reflections.
I tried d(sin90 - sin45)=8.28m but the answer was not a choice.
dsin(90)=8.28m d(sin45)=8.28m the minimum of which is 8.28m but I am not sure if that is how to do it.
The difference between the two is sqrt2 (L). Find where the two line up.
PS light at a wavelength of 8.28 m???
Don't think so.