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The diffraction pattern of a light of wa...

The diffraction pattern of a light of wavelength "400nm" diffracting from a slit of width "0.2mm" is focused on the focal plane of a convex lens of focal length "100cm" .The width of the `1^(" st ")` secondary maxima will be :

A

0.02 mm

B

0.2 mm

C

2 mm

D

2 cm

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