In a dot matrix printer, an array of dots is used to form printed characters. If the dots are too close together, they cannot be resolved individually by the eye and therefore appear to form solid lines. Suppose that the pupil of the eye has a diameter of 2.0mm in bright yellow-green light (wavelength 563nm in a vacuum), that the material in the eye has an average refractive index of n = 1.36, and that the printed page is to be read at a distance of 0.50m. Considering the limit created by diffraction, find the smallest separation between the dots that the eye can see.