Question

a light is suspended a height h above a table of radius 1m. The illumination I(?) is…

a light is suspended a height h above a table of radius 1m. The illumination I(?) is proportional to cos?, and inversly proportional to r^2, where r is the distancefrom the light to a point P on the edge of the table. how far above the table should the light hang to maximize I at P ?

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