In a Young's double slit experiment with light of wavelength

PHYSICS · Single correct · CBSE · Physics · Wave Optics · Wave Optics

Problem

\lambda

, the separation of slits is

d

and distance of screen is

D

such that

D \gg d \gg \lambda

. If the fringe width is

\beta

, the distance from point of maximum intensity to the point where intensity falls to half of maximum intensity on either side is: (1)

\frac{\beta}{6}

(2)

\frac{\beta}{3}

(3)

\frac{\beta}{4}

(4)

\frac{\beta}{2}