A helium-neon laser (wavelength 632.8 nm) illuminates a double slit experiment, positioned 35 cm from the laser. Both sl

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A helium-neon laser (wavelength 632.8 nm) illuminates a double
slit experiment, positioned 35 cm from the laser. Both slits are
0.3 mm wide and their centers are 2 mm apart. The diffraction and
interference pattern is displayed on a screen 1 m away, parallel to
the double slit experiment.
1) How many interference maxima are visible on the screen in the
angular region (-30°, 30°) relative to the central point between
the two slits?
2) Calculate the width of the central diffraction peak
3) Calculate the intensity of the double-slit experiment on the
screen at a distance of 5.7 cm from the center as a function of the
incident intensity l0.