A) increased by \[(\mu -1)\,t\]
B) decreased by \[\mu \,t\]
C) decreased by \[(\mu -1)\,t\]
D) increased by \[\mu \,t\]
Correct Answer: A
Solution :
If a transparent thin film of mica or glass is put in the path of one of the waves, then the whole fringe pattern gets shifted towards the slit in front of which glass plate is placed. The additional path difference is \[(\mu -1)t\].
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