As shown in the figure, in Young's double slit experiment, a thin plate of thickness 
and refractive index 
is inserted infront of slit 
. The experiment is conducted in air 
and uses a monochromatic light of wavelength 
. Due to the insertion of the plate, central maxima is shifted by a distance of 
is the fringe-width befor the insertion of the plate. The value of the 
is
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Given 
When the glass slab inserted infront of one slit then the shift of central fringe is obtained by
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