physics

Coherent light of frequency 6.38×1014 Hz passes through two thin slits and falls on a screen 80.0 cm away. You observe that the third bright fringe occurs at ± 3.08 cm on either side of the central bright fringe.
How far apart are the two slits?
At what distance from the central bright fringe will the third dark fringe occur?

asked by ChrismB

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