A physics teacher wants to demonstrate interference with the help of double slit experiment using a laser beam of $633\text{ nm}$ wavelength. Since the hall is large enough, interference pattern is formed on the wall $5.0\text{ m}$ from the slits. For clear and comfortable view by all the students they want the fringe width $5\text{ mm}$. (I) Find the slit separation for obtaining the desired interference pattern. (II) How far will the first minimum be from the central maximum ?