Question

Light of wavelength 600 nm is incident normally on a slit of width 0.2 mm. The angular width of central maxima in the diffraction pattern is (measured from minimum to minimum) 

(1) 4 x 10^-3 rad 

(2) 4.5 x 10^-3 rad 

(3) 6 x 10^-3 rad 

(4) 2.4 x 10^-3 rad

Answer 1

Correct option (3) 6 x 10^-3 rad

Explanation:

Linear width of central maxima is = 2 λD/a

Angular width of central maxima is