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

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

Coherent light of frequency 6.38×10¹⁴ Hz passes through two thin slits and falls on a screen 81.0 cm away. You observe that the third bright fringe occurs at ± 3.06 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?

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