Coherent light of frequency 6.32 x 1014 Hz passes through two thin slits and falls on a screen 85.0 cm away. You observe that th
e third bright fringe occurs at ±3.11 cm on either side of the central bright fringe. (a) How far apart are the two slits?
(b) At what distance from the central bright fringe will the third dark fringe occur?
