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Light from a laser strikes a diffraction grating that has 4250 grooves per centimeter. The central and second order principal maxima are separated by 0.850m on a wall 1.50m from the grating.

a. Find the wavelength of the laser.

b. In separate experiment, microwaves of wavelength 5.00cm pass through a tall, narrow slith of width 36.0cm. If the microwaves are projected to a wall 6.50m from the slit, find the central maximum width of the microwaves diffraction pattern.

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