The overall luminous efficiency of a 100 W electric lamp is 25 lumen/W. Assume that light is emitted by the lamp only in the forward half, and is uniformly distributed in all directions in this half. Calculate the luminous flux falling on a plane object of area 1 cm' placed at a distance of 50 cm from the lamp and perpendicular to the line joining the lamp and the object.
The overall luminous efficiency of a 100 W electric lamp is 25 lumen/W. Assume that light is emitted by the lamp only in the forward half, and is uniformly distributed in all directions in this half. Calculate the luminous flux falling on a plane object of area 1 cm' placed at a distance of 50 cm from the lamp and perpendicular to the line joining the lamp and the object.
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Transcribed Image Text:The overall luminous efficiency of a 100 W electric lamp
is 25 lumen/W. Assume that light is emitted by the lamp
only in the forward half, and is uniformly distributed in
all directions in this half. Calculate the luminous flux
falling on a plane object of area 1 cm² placed at a
distance of 50 cm from the lamp and perpendicular to
the line joining the lamp and the object.
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