Statement 1: If the whole apparatus of Young's experiment is immersed in liquid, the fringe width will decrease.Statement 2: The wavelength of light in water in more that of air.

When whole of the apparatus is immersed in water, then wavelength of light decreases form the relation λ′=λ/μ,μ being refractive index of water.Therefore, fringe width β=Dλd or β∝λ will decrease as λ decreases when immersed in water. Also we conclude that wavelength of light in water is less than that in air.