A lamp of luminous intensity 50 candela is placed at a distancde of 1 m from a wall What is the illuminacnce of the wall directly in front of lamp ? I
A lamp of luminous intensity 50 candela is placed at a distancde of 1 m from a wall What is the illuminacnce of the wall directly in front of lamp ? If another lamp of 100 cd is placed on the same line at a distance of 125 cm what is the illuminance now?
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