A beam of light of wave length 600 nm from a distance source fall on a single slit 1mm wide and a resulting. Diffraction pattern is observed on a screen 2m away. The distance between the first dark fringes on either side of central bright fringe is

Options

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

Answer

D

Explanation

The distance between the first dark fringe on either side of the central maximum=width of central maximum
`=(2Dlamda)/(a)=(2xx2xx600xx10^-9)/(10^-3)=2.4xx10^-3 m=2.4 mm