A) 7
B) 4
C) 8
D) 6
Correct Answer: A
Solution :
The change in path length \[=(\mu -1)t.\] This path length change the position of bright fringe upto seventh bright fringe. The thickness of plastic substance inserted in the path of rays will must be 7 (on assuming fringe width to be units).You need to login to perform this action.
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