YDSE is conducted using light of wavelength 6000 
to observe an interference pattern. When a film of some material 3. 0 x 10 -3 cm thick was placed over one of the slits, the fringe pattern shifted by a distance equal to 10 fringe widths. What is the refractive index of the material of the film?
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1.2
Fringe width, 
... (i)
where, D: distance between screen and slit
d: distance between two slits
when a film of thickness t and refractive index 
is placed over one of the slit, the fringe pattern is shift by distance S and is given by
…(ii)
Given: S = 10 
... (iii)
From equations (i), (ii) and (iii), we get
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