Q. In Young’s experiment, monochromatic light is used to illuminate the two slits $A$ and $B$. Interference fringes are observed on a screen placed in front of the slits. Now if a thin glass plate is placed normally in the path of the beam coming from the slit
A) The fringes will disappear
B) The fringe width will increase
C) The fringe width will decrease
D) There will be no change in the fringe width but the pattern shifts
Explanation
(d) In the presence of thin glass plate, the fringe pattern shifts, but no change in fringe width occurs
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.