To make the central fringe at the center 
, a mica sheet of refractive index 1.5 is introduced. Choose the correct statements (s)
A
The thickness of sheet is 
infront of 
.
infront of . B
The thickness of sheet is 
infront of 
.
infront of . C
The thickness of sheet is 
infront of 
.
infront of . D
The thickness of sheet is 
infront of 
.
infront of .
Text Solution
Verified by ExpertsThe correct answer is:
A
We have, 
So, 
So mica sheet should place at 
to overcome the path difference introduce by 
.
To make central fringe at ' 
', 
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