In a double-slit experiment the slit width is and the separation is

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

Problem

In a double-slit experiment the slit width is

a = 0.08\,\text{mm}

and the separation is

d = 0.32\,\text{mm}

. The apparatus is illuminated with light of wavelength

\lambda = 640\,\text{nm}

. Using the small-angle approximation, at what angle

\theta

(measured from the central axis) will the first missing interference maximum occur? (a)

0.11^{\circ}

(b)

0.22^{\circ}

(c)

0.44^{\circ}

(d)

0.06^{\circ}