A phenomenon known as Snell's window, sometimes known as Snell's circle or the optical manhole, allows an underwater observer to see everything above the surface through a cone of light with a width.
Snell's Law governs these phenomena, which is brought on by the refraction of light entering water. Some light is reflected off of water when light that is going through the air collides with it. The remaining light enters the water and travels through it, but it bends (or refracts) as it does so. When light strikes glass or any other transparent material, the same thing occurs. It is a well-known observation that objects appear bigger in water than in air, but the reason why is debatable.
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