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Light of wavelength  = 5000 Å falls normally on a narrow slit. A screen placed at a distance of 1 m from the slit and perpendicular to the direction of light. The first minima of the diffraction pattern is situated at 5 mm from the centre of central maximum. The width of the slit is

1. 0.1 mm
2. 1.0 mm
3. 0.5 mm
4. 0.2 mm

Correct answer: 0.1 mm

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