Young's double slit experiment gives interference fringes of width 
. A thin glass plate made of material of refractive index 1.5 is kept in the path of light from one of the slits, then the fringe width becomes
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: When a transparent sheet of thickness 
and refractive index 
is introduced in one of the paths of the interfering waves then the path increases by 
and the whole pattern shifts by
Shifting is towards the side in which the plate is introduced without any change in fringe width as shown in figure.
Therefore, when a thin glass plate of refractive index 1.5 is kept in the path of light from one of the slits, only the fringes get shifted but the fringe width remains unchanged. i.e. 
.
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