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Coherent monochromatic light of frequency 6.15 × 1014 Hz passes through two narrow slits and falls...

Coherent monochromatic light of frequency 6.15 × 1014 Hz passes through two narrow slits and falls on a screen located 2.50 m away. The m = 20 bright fringe is at a distance of 1.45 m from the center of the pattern. (Do not use the small-angle approximation)

1) What is the distance between the two slits?

2) What is the distance of the m = 15 dark fringe from the center of the pattern?

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