The central bright fringe in a single-slit diffraction pattern from light of wavelength $476 \mathrm{nm}$ is $2.0 \mathrm{cm}$ wide on a screen that is $1.05 \mathrm{m}$ from the slit. (a) How wide is the slit? (b) How wide are the first two bright fringes on either side of the central bright fringe? (Define the width of a bright fringe as the linear distance from minimum to minimum.)