Coherent light of frequency 6.40 x 1014 Hertz passes through two thin slits and falls on a screen 90 centimeter away. You observe that the third bright fringe occurs at ± 3.07 centimeter on either side of the central bright fringe.
Part A: Calculate how far apart are the two slits?
Answer in mm
Part B: Find at what distance from the central bright fringe will the third dark fridge occur?
Answer in cm