A beam of light of wavelength 600 nm from a distant source falls normally on a single-slit, 1 mm wide, and the resulting diffraction pattern is obtained on a screen 2.0 away. The distance between the first dark fringes on either side of the central bright fringe is

Options

A. 1.2 mm
B. 1.2 cm
C. 2.4 cm
D. 2.4 mm

Answer

D

Explanation

Distance between the first dark fringe on either side of central bright fringe`=(2Dlamda)/(a)`
`=(2xx2.0xx(600xx10^(-9)))/((1xx10^(-3)))=2.4xx10^(-3)m or 2.44mm`.