A) \[\frac{(\mu -1)t}{dD}\]
B) \[0\]
C) \[\infty \]
D) \[\frac{(\mu -1)tD}{d}\]
Correct Answer: D
Solution :
On placing a mica sheet of thickness t and refractive index \[\mu \]. Displacement in fringe \[=\frac{(\mu -1)\,t\,D}{d}\]
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