Question: A pit in the earth (at sea level) with a planoconvex glass lens on top: The pit is 1m deep. If I want to see

A pit in the earth (at sea level) with a planoconvex glass lens on top:

The pit is 1m deep. If I want to see an energy density of 0.6 w/cm2 at the bottom of the pit on a bright sunny day, what should the radius of curvature of the lens’ surface be?

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