A thin sheet of mica (\[\mu \] m thick) is placed in the path of one o – McqOptions

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1.	A thin sheet of mica (\[\mu \] m thick) is placed in the path of one of the interfering beams in a biprism arrangement. It is found that the central bright band shifts a distance equal to the width of a bright fringe. The refractive index of mica \[(Given\,\,\lambda =6\times {{10}^{-7}}\,m)\] is
A.	1.0
B.	1.5
C.	1.75
D.	1.25
Answer» C. 1.75

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