A point source of light is submerged 20 m below the surface
A point source of light is submerged 2.0 m below the surface of a lake and emits rays in all directions. On the surface of the lake, directly above the source, the area illuminated is a circle. What is the maximum radius that this circle could have?
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a point source of light is submerged 20 m below the surface of a lake and emits rays in all directions on the surface
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