With two slits spaced apart and a screen at a distance of

PHYSICS · Single correct · A Level · Physics · Waves · Waves

Problem

With two slits spaced

0.2\text{ mm}

apart and a screen at a distance of

1\text{ m}

, the third bright fringe is found to be at

7.5\text{ mm}

from the central fringe. The wavelength of light used is (1)

400\text{ nm}

(2)

500\text{ nm}

(3)

550\text{ nm}

(4)

600\text{ nm}