In a doulble slit experiment when a thin film of thickness t having refractive index `mu` is introduced in from of one of the slits, the maximum at the centre of the fringe pattern shifts by one width. The value of t is `(lamda` is the wavelength of the light used)
A
`(2lamda)/((mu-1))`
B
`(lamda)/(2(mu-1))`
C
`(lamda)/((mu-1))`
D
`(lamda)/((2mu-1))`
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A
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