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  4. An isotropic source of 2 candela produces a light flux equal to

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Q. An isotropic source of $2$ candela produces a light flux equal to

Bihar CECEBihar CECE 2009Ray Optics and Optical Instruments

Solution:

Given, $L=2$ cd The light flux $\phi=4 \pi L$
$=4 \pi \times 2$
$\phi =8 \pi$ lumen