The liquid is water. The refractive index of water is 1.333 and density of water is 1.0 g/cm^{3}. The refractive index of a medium can be calculated using the following formula:

[tex]n = \frac{c}{v}[/tex]

where n is the refractive index of the medium

c is the velocity of light in vacuum

v is the velocity of light in the medium