In which of the following situations central fringe in YDSE may be dark?
A
By immersing 
in a liquid
in a liquid B
By placing transparent sheet of same thickness and same material in front of both slits
C
By moving screen
D
By placing transparent sheet in front of a slit
Text Solution
Verified by ExpertsThe correct answer is:
D
Placing a transparent sheet in front of one slit introduces an additional path difference due to the sheet's refractive index.
If this extra path difference equals an odd multiple of 
, the central fringe (which is normally bright) becomes dark.
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