Two narrow and parallel slits are 0.50 mm apart. a light beam in air consisting of two frequencies 6.67 x 1014 hz (blue) and 4.50 x 1014 hz (red) is shone on the slits and an interference pattern is formed on a screen 1.50 m away. (a) how far apart (in mm) are the 3rd bright fringe above the central bright fringe for blue and the 2nd dark fringe below the central bright fringe for red? (b) what are the widths of the central bright fringes of blue and red?