A linear aperture whose width is 0.02 cm is placed immediately in front of a lens of focal length 60cm. The aperture is illuminated normally by a parallel beam of wavelength $$5\times10^{-5}$$ cm. The distance of the first dark band of the diffraction pattern from the centre of the screen is

A

0.25 cm

B

0.20 cm

C

0.15 cm

D

0.10 cm