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Luminous Intensity

The luminous ...

Question

The luminous intensity of 100 W unidirectional bulb is 100 candela. The total luminous flux emitted from bulb will be

A

100 π

lumen

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B

200 π

lumen

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C

300 π

lumen

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D

400 π

lumen

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Solution

The correct option is A $400 π$ lumen
Luminous flux = luminous intensity * solid angle = $10 * 4 π = 400 π$ lumen

Answer. D) $400 π$ lumen

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