First slide

Young's double slit Experiment

Question

The slits in a Young's double slit experiment have equal widths and the source is placed symmetrically relative to the slits. The intensity at the central fringes is I₀. If one of the slits is closed, the intensity at this point will be

Easy

A

$I_{0}$
B

$I_{0} / 4$
C

$I_{0} / 2$
D

$4 I_{0}$

Solution

If intensity of each wave is I, then initially at central position $I_{o} = 4 I .$ When one of the slit is covered then intensity at central position will be I only, i.e., $\frac{I_{o}}{4} .$

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