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35.18 Coherent light of frequency 6.38×1014 Hz passes through two thin slits and falls on a...

35.18

Coherent light of frequency 6.38×1014 Hz passes through two thin slits and falls on a screen 85.0 cmaway. You observe that the third bright fringe occurs at ± 3.10 cm on either side of the central bright fringe.

1- How far apart are the two slits?

2-

At what distance from the central bright fringe will the third dark fringe occur?
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