Young’s double slit interference apparatus is immersed in a liquid of refractive index 1.44. It has slit separation of 1.5mm. The slits are illuminated

Young double slit interference apparatus is immersed in a liquid of refractive index 1.44. It has slit separation of 1.5mm. The slits are illuminated by a parallel beam of light whose wavelength in air is 690 nm. The fringe-width on a screen placed behind the plane of slits at a distance of 0.72m, will be : 

(1) 0.23 mm 

 (2) 0.33 mm 

(3) 0.63 mm

 (4) 0.46 mm                    (JEE-2025)