In a double slit experiment, when a thin film of thickness 
having refractive index 
is introduced in front of one of the slits, the maximum at the centre of the fringe pattern shifts by one fringe width. The value of 
is 
is the wavelength of the light used):
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
JEE Main 2019
Given, 
or 
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