Question

There are two sets of apparatus of Young’s double slit experiment. In set A, the phase
difference between the two waves emanating from the slits does not change with time,
whereas in set B, the phase difference between the two waves from the slits changes rapidly
with time. What difference will be observed in the pattern obtained on the screen in the two
set ups?

Answer 1

(a) Set A: stable interference pattern, the positions of maxima and minima does not change with time. Set B : positions of maxima and minima will change rapidly with time and an average uniform intensity distribution will be observed on the screen

Answer 2

There are two sets of apparatus of young double slit experiment and in both the pattern observed on the screen is different in both

In A the phase difference between the two waves emenating from from the slits do not change while in the second one the phase difference changes immediatelly