Published by:
CGP EDU Academic Team
Published on: August 14, 2026
In Young's double slit experiment, two slits 
and 
are ' 
' distance apart and the separation from slits to screen is D (as shown in figure). Now if two transparent slabs of equal thickness 
but refractive index 1.51 and 1.55 are introduced in the path of beam 
from 
and 
respectively. The central bright fringe spot will shift by number of fringes.
Text Solution
Verified by ExpertsThe correct answer is:
10
(10)
Shifting central maxima
Now
Fringe width 
No. of fringes shifted 
Ans. 10
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