Answer to Question #284529 in Optics for luna

Question

Determine the total luminous flux emitted by the source if the illumination is

15 lx at the distance 2 m from that source. The luminous intensity is equal in all directions.

Answer 1

source if the illumination=15 lx

r=2 m

$I=\frac{E}{A}$

Intensity

$I=\frac{15}{4\pi r^2}$

Put value

$I=\frac{15}{4\times3.14\times4}=0.2985lx/m^2$