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Red light of wavelength 633 nm from a helium-neon laser passes through a slit 0.400 mm...

Red light of wavelength 633 nm from a helium-neon laser passes through a slit 0.400 mm wide. The diffraction pattern is observed on a screen 3.25 m away. Define the width of a bright fringe as the distance between the minima on either side.

Part A: What is the width of the central bright fringe?

Part B: What is the width of the first bright fringe on either side of the central one?

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