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4) In the diffraction experiment, laser light ( l = 4.65 * 10-4 mm) was sent...

4) In the diffraction experiment, laser light ( l = 4.65 * 10-4 mm) was sent at a slit of width 0.077 mm. How many dark fringes were counted between the two marks 5.06 cm apart, if the distance from the slit to the screen was 93 cm?

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