Two coherent slits are apart

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

Problem

Two coherent slits are

0.40\,\text{mm}

apart. A glass plate of thickness

4.56\,\mu\text{m}

and refractive index

1.52

is placed in front of one slit. Determine the approximate angular shift (in milliradians) of the central maximum on the distant screen. (a)

4.5\,\text{mrad}

(b)

5.9\,\text{mrad}

(c)

3.8\,\text{mrad}

(d)

7.4\,\text{mrad}