# To make the central fringe at the centerO , mica sheet of refractive index 1.5 is introduced Choose the corect statement.

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To make the central fringe at the centerO , mica sheet of refractive index 1.5 is introduced Choose the corect statement.

A. The thickness of sheet is (d^(2))/(D) in front of S_(1)
B. The thickness of sheet is (d^(2))/(D) in front of S_(2)
C. The thickness of sheet is (d^(2))/(2D) in front of S_(1)
D. The thickness of sheet is (d^(2))/(2D) in front of S_(1)

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