A physics student demonstrates Young's double-slit experiment using 632.8 nm light from a HeNe laser. The laser light passes through two narrowly separated slits that have a spacing of d. The light produces an interference pattern on a screen that is 4.20 meters in front of the slits. The spacing between the m=2 and m=3 maxima as seen on the screen is 12.0 cm.
Determine the spacing between the slits.
For the situation described above, determine the phase difference between the rays from the two slits arriving at a position 18.0 cm above the central maximum. Describe the intensity of light at this position as a fraction of the maximum intensity Imax on the screen.
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