Physics-
General
Easy
Question
A double slit 
is illuminated by a coherent light of wavelength 
. The slits are separated by a distance d. A plane mirror is placed in front of the double slit at a distance 
from it and a screen 
is placed behind the double slit at a distance 
from it. The screen receives only the light
The correct answer is:
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Two transparent slabs having equal thickness but different refractive indices 
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which is equidistant from the slits?
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