Lux is a unit of

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(B) The unit of illuminance (or illumination) in the International System of Units $(SI)$ is the lux $(lx)$.Illuminance is defined as the luminous flu

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Illuminance on a surface

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(B) The unit of illuminance (or illumination) in the International System of Units $(SI)$ is the lux $(lx)$.Illuminance is defined as the luminous flux per unit area incident on a surface.Mathematically,$E = \frac{\Phi}{A}$,where $E$ is illuminance in lux,$\Phi$ is luminous flux in lumens $(lm)$,and $A$ is the area in square meters $(m^2)$.Therefore,$1 \ lx = 1 \ lm/m^2$.Thus,the correct option is $B$.

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