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.

Options

A. the intensities of both the maxima and the minima increase
B. the intensity of maxima increases and the mina has zero intensity
C. the intensity of maxima decreases and that of the minima increases
D. the intensity of maxima decreases and the minima has zero intensity

Answer

A

Explanation

In interference between waves of equal amplitudes a, the minimum intensity is zero and the maximum intensity is proportional to `4a^(2)` (because slit width `prop` amplitude)For waves of unequal amplitudes a and A `(A gt a)` the minimum intensity is non zero and the maximum intensity is proportional to `(a+A)^(2)` which is greater than `4a^(2)` so the intensities of both the maxima and the minima increase.