The illuminance on an object that is 1. 50 m away from a light source with a luminous flux of 665 lumens will be 23. 5 lx.
Electromagnetic radiation is emitted by a light source. The sun and microwaves are examples of daily light sources.
The given data in the problem is;
r is the distance from the light source=1. 50 m
P is the luminous flux = 665 lumens
E is the illuminance
The illuminance is found as;
[tex]\rm E = \frac{P}{4\pi r^2} \\\\ \rm E = \frac{665}{4 \times 3.14 \times (1.5)^2} \\\\ \rm E =23.5\ lx[/tex]
The illuminance on an object that is 1. 50 m away from a light source with a luminous flux of 665 lumens will be 23. 5 lx.
Hence option C is correct.
To learn more about the light source refer to the link;
https://brainly.com/question/14459326
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