A beam of light of wavelength 600 nm from a distance source falls on a single slit 1 mm wide and resulting diffraction pattern is observed on a screen 2m away. What is the distance between the first bright fringes on either side of the central bright fringe ?

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 bight fringe = width of central maxium.
` = (2D lambda)/(a) = (2 xx 2 xx 600 xx 10^(-9))/( 10^(-3))`
` = 2.4 xx 10^(-3) m = 2.4 mm`