Two glass plates are separated by fine wires with diameters d1 = 0.0500 mm and d2 = 0.0520 mm, as indicated in FIGURE 28-48. The wires are parallel and separated by a distance of 7.00 cm. If monochromatic light with λ = 589 nm is incident from above, what is the distance (in cm) between adjacent dark bands in the reflected light? (Consider interference only between light reflected from the bottom surface of the upper plate and light reflected from the upper surface of the lower plate.)
In figure 28-48

0.0500 mm 0.0520 mm- 7.00 cm-