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In a Young's double slit experiment, a sheet of thickness 100 µm and refractive index 1.5 is introduced as shown in the figure. A sheet of thickness t and refractive index 2 is introduced in lower ray's path. It is observed that there is no displacement in the fringes. The value of t is

A
100 μm
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B
200 μm
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C
150 μm
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D
50 μm
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