In Young's experiment, monochromatic light is used to illuminate the two slits textA 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, then which of the following explanation holds true with regards to fringes/fringe width?

Question

In Young's experiment, monochromatic light is used to illuminate the two slits textA 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, then which of the following explanation holds true with regards to fringes/fringe width? <img class="img-fluid question-image" alt="Question" src="https://cdn.tardigrade.in/q/nta/p-4meashewhzh6.png" /> (A) fringes will disappear (B) fringe width will increase (C) fringe width will increases (D) there will be no change in the fringe width but fringe pattern will shift

Tardigrade Admin · Accepted Answer

In the presence of thin glass plate, the fringe width pattern shifts, but no change in fringe width. It is because of the uniform path difference that gets introduced by adding a glass plate.