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

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

Haryana PMTHaryana PMT 1999

Solution:

Intensity $ I=2 $ candela
Hence, flux is given by $ F=4\pi \,l=4\pi \times 2=8\pi $ lumen