Section-C: Comprehension Type
In a Young’s double slit experiment set up, source S of wavelength 6000Å illuminates two slits S1 and S2 which act as two coherent sources. The source S oscillates about its shown position according to the equation y = 1 + cos πt
where y is in mm and t is in s. P is taken to be the origin of co-ordinate system.
At t = 0, fringe width is β1, and at t = 2 seconds, fringe width of figure is β2. Then