In a Young's double-slit experiment, ,

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

Problem

In a Young's double-slit experiment,

d=1\,\mathrm{mm}

\lambda=6000\,\text{\AA}

, and

D=1\,\mathrm{m}

. The slits produce equal intensities on the screen. The minimum distance between two points on the screen having

75\%

of the maximum intensity is (a)

0.45\,\mathrm{mm}

(b)

0.40\,\mathrm{mm}

(c)

0.30\,\mathrm{mm}

(d)

0.20\,\mathrm{mm}