First slide

Young's double slit Experiment

Question

In a double slit experiment, instead of taking slits of equal widths, one slit is made twice as wide as the other. Then, in the interference pattern

Moderate

A

the intensities of both the maxima and the minima increases
B

the intensity of the maxima increases and the minima has zero intensity.
C

the intensity of the maxima decreases and that of the minima increases
D

the intensity of the maxima decreases and the minima has zero intensity.

Solution

$I_{min} \propto (a_{1} - a_{2})^{2}$
$I_{min}^{'} \propto (2 a - a)^{2}$
Clearly, the intensity of minima increases.
Again $I_{max} \propto (a_{1} + a_{2})^{2}$
$I_{max}^{'} \propto (2 a + a)^{2}$
Clearly, the intensity of maxima increases.

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