In a Young's double slit experiment set up, the two slits are kept 0.4 mm apart and screen is placed at 1 m from slits. If a thin transparent sheet of thickness 
is introduced in front of one of the slits then center bright fringe shifts by 20 mm on the screen. The refractive index of transparent sheet is given by 
, where 
is 
Text Solution
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1. (14) In Young's Double Slit Experiment, when a thin transparent sheet of thickness 
and refractive
index 
is introduced in front of one slit, the central bright fringe shifts by a distance 
.
The formula for the shift is given by 
.
Given values:
Distance between slits 
Distance to screen 
Thickness of sheet 
Shift 
Substituting the values into the formula:
The refractive index is given as 
.
So, 
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