Dimensions of luminous flux are

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(B) Luminous flux is defined as the rate of flow of light energy,which is equivalent to radiant power. The $SI$ unit of luminous flux is the lumen $(l

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$M L^2 T^{-3}$

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(B) Luminous flux is defined as the rate of flow of light energy,which is equivalent to radiant power. The $SI$ unit of luminous flux is the lumen $(lm)$,which is a unit of power. Therefore,the dimensions of luminous flux are the same as the dimensions of power. Power $(P)$ is defined as work done $(W)$ per unit time $(t)$: $P = W / t$. The dimensions of work are $[M L^2 T^{-2}]$ and the dimensions of time are $[T]$. Thus,the dimensions of power are $[M L^2 T^{-2}] / [T] = [M L^2 T^{-3}]$.

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