Religious Studies homework help

We said that color depends on wavelength. Forexample, for an object emitting 650 nm light inair, we see red. But this is true only in air. If weobserve this same object when under water, itstill looks red. But the wavelength in water ?nis 650 nm/1.33 = 489 nm. Light with wavelength489 nm would appear blue in air. Can youexplain why the light appears red rather thanblue when observed under water