In Young's double-slit experiment

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

Problem

In Young's double-slit experiment, the slits are

2\ \text{mm}

apart and are illuminated with a mixture of two wavelengths,

\lambda_0=750\ \text{nm}

and

\lambda=900\ \text{nm}

. The minimum distance from the common central bright fringe on a screen

2\ \text{m}

from the slits, where a bright fringe from one interference pattern coincides with a bright fringe from the other, is (1)

1.5\ \text{mm}

(2)

3\ \text{mm}

(3)

4.5\ \text{mm}

(4)

6\ \text{mm}