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

• 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.

Answer 1

Answer: (A)

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