In YDSE, if bichromatic light of wavelengths and is used, the maxima due to both…

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

Problem

In YDSE, if bichromatic light of wavelengths

\lambda_1

and

\lambda_2

is used, the maxima due to both lights overlap at a distance

y

from the central maximum. Take the slit separation as

d

and the distance between the screen and slits as

D

. Then

y

is (1)

\left(\frac{\lambda_1+\lambda_2}{2D}\right)d

(2)

\left(\frac{\lambda_1-\lambda_2}{D}\right)2d

(3) LCM of

\frac{\lambda_1D}{d}

and

\frac{\lambda_2D}{d}

(4) HCF of

\frac{\lambda_1D}{d}

and

\frac{\lambda_2D}{d}