What is the width of the slit

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For a demonstration, a professor uses a razor blade to cut a thin slit in a piece of aluminum foil. When she shines a laser pointer (?=680nm) through the slit onto a screen 5.6m away, a diffraction pattern appears. The bright band in the center of the pattern is 7.8cm wide.

What is the width of the slit? in mm

Reference no: EM13242218

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