question_answer

In a YDSE experiment if a slab whose refraction index can be varied is placed in front of one of the slits then the variation of resultant intensity at mid-point of screen with 'u' will be best represented by \[(\mu \ge 1)\]. [Assume slits of equal width and there is no absorption by slab; midpoint of screen is the point where waves interfere with zero phase difference in absence of slab]               

A)       

B)

C)

D)