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Q.

A beam of light of wavelength 600nm from a distant source falls on a single slit 1.0mm wide and the resulting diffraction pattern is observed on a screen 2m away. What is the width of central maximum?

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answer is 2.

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Detailed Solution

The distance of 1st minimum from centre of primary maximum isy1=λDd=6×10−7×21×10−3=1.2 mmwidth of central maximum w=2y1=2.4 mm
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