how does the fringe width of interference fringes change,when thw whole apparatus of Young's experiment is kept in liquid of - Physics - Wave Optics

Question

how does the fringe width of interference fringes change,when
thw whole apparatus of Young's experiment is kept in liquid of
refractive index 1 33??

Karan Sandhu · Answer

the fringe width will decrease because the refractive index of
water is 1 33 and the wavelength of the monochromatic light will
change from λ to λ/1 33 so the fringe width will
decrease from λD/d to λD/1 33d

how does the fringe width of interference fringes change,when thw whole apparatus of Young's experiment is kept in liquid of refractive index 1.33??