In Young's double slit arrangement, slits are separated by a gap of 0.5 mm, and the screen is placed at a distance of 0.5 m from them. The distance between the first and the third bright fringe formed when the slits are illuminated by a monochromatic light of 5890A˚ is:
(a) 1178×10−9 m
(b) 1178×10−6 m
(c) 1178×10−12 m
(d) 5890×10−7 m