The Impressionist painter Georges Seurat used a technique called “pointillism,” in which his paintings are composed of small, closely spaced dots of pure color, each about 2 mm in diameter. The illusion of the colors blending together smoothly is produced in the eye of the viewer by diffraction effects. Calculate the minimum viewing distance for this effect to work properly. Use the wavelength of visible light that requires the greatest distance, so that you’re sure the effect will work for all visible wavelengths. Assume the pupil of the eye has a diameter of 3 mm.