After a laser beam passes through two thin parallel slits, the first completely dark fringes occur at $16\mathrm{.}016\mathrm{.}0$ with the original direction of the beam, as viewed on a screen far from the slits.

Part A

What is the ratio of the distance between the slits to the wavelength of the light illuminating the slits?

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Part B

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?