A Young's double-slit experiment is performed using light of wavelength

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

Problem

\lambda=5000\,\text{\AA}

, which emerges in phase from two slits separated by

d=3\times10^{-7}\,\text{m}

. A transparent sheet of thickness

t=1.5\times10^{-7}\,\text{m}

and refractive index

\mu=1.17

is placed over one slit. The central maximum of the interference pattern now appears at, where

D

is the distance between the slits and screen, (a)

0.085D

(b)

D

(c)

1.2D

(d)

0.5D