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A screen with linear aperture whose widt...

A screen with linear aperture whose width is 0.02 cm is placed immediately in front of a lens of focal length 60 cm The aperture is illuminated normally by a parallel beam of wavelength `5xx10^-5` cm.The distance of the first dark band of the diffraction pattern from the centre of the screen is.

A

0.20 cm

B

0.15 cm

C

0.10 cm

D

0.25 cm

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