# NEET Physics Ray Optics and Optical Instruments Questions Solved

A 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 $5×{10}^{-5}$ cm. The distance of the first dark band of the diffraction pattern from the centre of the screen is-

(a) 0.10 cm             (b) 0.25 cm

(c) 0.20 cm             (d) 0.15 cm