Question

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

• A. The intensities of both the maxima and the minima increase.
• B. The intensity of the maxima increases and the minimum 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.

Answer 1

The correct option is A The intensities of both the maxima and the minima increase.

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