A small lamp at the bottom of a pool of 2 m deep in water (n = 4/3), emits light upwards in all directions (isotropic source). On the surface of the water, a circular illuminated area appears due to the refraction of the light rays. Determine the radius R of this illuminated area.

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A small lamp at the bottom of a pool of 2 m deep in water (n = 4/3), emits light upwards in all directions (isotropic source). On the surface of the water, a circular illuminated area appears due to the refraction of the light rays. Determine the radius R of this illuminated area.

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