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  4. ‘Lumen’ is the unit of

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Q. ‘Lumen’ is the unit of

UPSEEUPSEE 2019

Solution:

The lumen is the SI derived unit of luminous flux, a measured of the total quantity of visible light emitted by a source per unit time.
where,
$1$ lumen ($1$m ) $= 1\,\, Cd/Sr$
$\because \,Cd = $ candela and $Sr = $ steradians