A bulb is hanging over a table. At which portion of the table is the illuminance maximum? If a plane mirror is placed above the bulb facing the table, will the illuminance on the table increase?

The value of the illuminance observed is maximum below the bulb, because light falls normally just below the table.


The illuminance on the table increase when a plane mirror is placed above the bulb facing the table. This is observed because the radiant flux increases due to the plane mirror.


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