In a double slit experiment, the two slits are 1 mm apart and the screen is placed 1 m away. A monochromatic light wavelength 500 nm is used. What will be the width of each slit for obtaining ten maxima of double slit within the central maxima of single slit pattern ? (a) 0.1 mm (c) 0.02 mm (b) 0.5 mm (d) 0.2 mm