Question: After a laser beam passes through two thin parallel slits, the first completely dark fringes occur at 1 9 . 0 with the original direction

After a laser beam passes through two thin parallel slits, the first completely dark fringes occur at

19.0

with the original direction of the beam, as viewed on a screen far from the slits. What is the ratio of the distance between the slits to the wavelength of the light illuminating the slits? What is the smallest positive angle, relative to the original direction of the laser beam, at which the intensity of the light is

110110

the maximum intensity on the screen?

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