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Wave Optics

Question
CBSEENPH12038361

How does the fringe width of interference fringes change, when whole apparatus of Young's experiment is kept in a liquid of refractive index 1.3?

Solution
The fringe width in a Young's double-slit experiment is given by
 
                             ω =λDd 

The fringe width is not affected if the whole apparatus is placed in a liquid of refractive index 1.3.