Physics

Problem

In a Young's double slit experiment, the slits are placed 0.320 mm apart. Light of wavelength

\lambda = 500 \text{ nm}

is incident on the slits. The total number of bright fringes that are observed in the angular range

-30^\circ \le \theta \le 30^\circ

is (a) 640 (b) 320 (c) 321 (d) 641