I have attached the problem as the image is needed for the question. a) Basically, from what I understand the wave is being split, thus each chamber receives the total number of wavelengths/2. The chambers, however are vacuums, so the number of wavelengths passing in doesn't change right? Looking at my formulae for interferometers for destructive and constructive interference I cannot see one that would contribute to solving this part of the problem? my formulae: L=m[itex]\lambda[/itex]/2 constructive interference, L=(m+.5)[itex]\lambda[/itex]/2 for destructive interference. b) I need a to find this part I believe. c) Need b.