Question

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

Answer 1

 The fringe width will decrease. When light enters a denser medium, its wavelength decreases by a factor 1.3 and hence the fringe width also decreases by a factor 1.3.

Answer 2

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$<b><i><u>✔$The width of fringe decreases .

✔ It's wave length decreases with factor 1.3 So , the width of the fringe will also decrease at factor of 1.3 .