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The diffraction pattern of a light of wavelength 400 nm diffracting from a salt of width 0.2 mm is focused on the focal plane of a convex lens of focal length 100 cm. The width of the 1 st secondary

1. 0.2 mm
2. 2 mm
3. 0.02 mm
4. 2 cm

Correct answer: 2 mm

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