1991B6. Light consisting of two wavelengths, λa=4.4×10−7 meter and λb=5.5×10−7 meter, is incident normally on a barrier with two slits separated by a distance d . The intensity distribution is measured along a plane that is a distance L=0.85 meter from the slits as shown above. The movable detector contains a photoelectric cell whose position y is measured from the central maximum. The first-order maximum for the longer wavelength λb occurs at y=1.2×10−2 meter.
a. Determine the slit separation d.
b. At what position, Ya, does the first-order maximum occur for the shorter wavelength λa ?
