Why can't I see a Ray of light coming from the laser in air but able to see the light when it passes through water while visualizing the Snell's Law for refraction?

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Solution

The laser beam must be of a wavelength that is visible to humans, and fog or dust scatters the light very strongly so that you can see it. However, even in pure, clean air, you will be able to see a laser beam under certain conditions. This is because light can scatter from air molecules themselves via Rayleigh scattering.
when this light passes through the water its scatter more than the air that's why we see in water.

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