2. A screen is separated from a double-slit setup by a distance of 2.15 m. The slit spacing is 0.0150 mm. The first-order maximum is 4.05 cm from the centerline. Find (a) the wavelength, (b) the distance between adjacent fringes. (6 points) 3. 585 nm light hits a slit (note, just the one slit) that is 0.300 mm in width. The observing screen is 2.50 m away. Find (a) the position of the first dark fringe and (b) the width of the (6 points) central bright fringe. 4. A diffraction grating has exactly 5 000 lines per centimeter. Helium laser light of wavelength 633 nm is incident on the grating. (a) What is the angle for the first order maxima? (b) If the grating is 1.25 m from a screen, what is the distance from central maxima to the first order maxima? (6 points)