In Young's double slit experiment, two slits Si and 82 are 4 d s distance apart and the separation from slits to screen is D (as shown in figure). Now if two transparent slabs of equal thickness 0.1 mm but refractive index 1.51 and 1.55 are introduced in the path of beam ( 
= 4000 
) from S 1 and S 2 respectively. The central bright fringe spot will shift by ________number of fringes.
Text Solution
Verified by ExpertsCHECK THE SOLUTION.
(10)
Path difference at P be 
x
= (1.55-1.51)0.1 mm
=0.04x10 -4
x = 4x10 -6 =4 
m
{y is the distance of central maxima from geometric center}
fringe width 
= 
= 4x10 -6 m 
= 4 
m 
Central bright fringe spot will shift by ‘x’
Number of shift = 
= 10 Ans
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