Question

In Young’s double slit experiment, a thin uniform sheet of glass is kept in front of the two slits,

parallel to the screen having the slits. The resulting interference pattern will satisfy

(A) The interference pattern will remain unchanged

(B) The fringe width will decrease

(C) The fringe width will increase

(D) The fringes will shift.​

Answer 1

Answer:

(A) The interference pattern will remain unchanged

Answer 2

In Young’s double-slit experiment, if a thin uniform sheet of glass is kept in front of the two slits, then (A) The interference pattern will remain unchanged.

• Young’s double-slit experiment is an experiment that shows the wave character of light.
• An interference pattern (dark and light fringes) is obtained on the screen placed in front of the two slits. This is due to the superposition of light from two slits.
• When a thin uniform sheet of glass is kept in front of both the slits the deviation produced due to each sheet is equal in magnitude but opposite in direction.
• Thus while one screen tends to increase the fringe width, the other decreases it by the same amount.
• Hence, the net effect is that there is no change in the fringe width.