Question

In Young’s double slit interference experiment the distance between two sources is 0.1 mm. The distance of the screen from the sources is 20 cm. The wavelength of light used is 5460 Å. Then the angular position of the first dark fringe is

(a) 0.08°

(b) 0.16°

(c) 0.20°

(d) 0.32°

Answer 1

Correct option  (b) 0.16°

Explanation:

The angular position,

The first dark fringe will be at half of the fringe width from midpoint of central maximum. Thus the angular