The angular width of the central maximum in a single sit diffraction pattern is 60∘. The width of the slit is 1 μm. The slit is illuminated by monochromatic plane waves. If another slit of same width is made near it, Young's fringes can be observed on a screen placed at a distance 50 cm from the silts. If the observed fringe width is 1 cm, what is slit separation distance? (i.e. distance between the centres of each slit)