Problem

A slit of size

0.15 \text{ cm}

is placed at

2.1 \text{ m}

from a screen. On illuminated it by a light of wavelength

5 \times 10^{-5} \text{ cm}

. The width of diffraction pattern will be: (a)

70 \text{ mm}

(b)

0.14 \text{ mm}

(c)

1.4 \text{ cm}

(d)

0.14 \text{ cm}