A point source of light is submerged below the surface of a pond and emits light in all directions. When viewed from above the water surface, directly over the light, the water surface area illuminated forms a circle. What is the depth of the light, below the water surface, to cause a circle of light on the surface with a radius of 2 m? What limits the size of this circle of light? The Take nwater = 1.33.

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