Please compute the case problem a, b, and c:
A 1,000 lumen source is 4 meter away from the center of a screen.The edge of the screen is 5 meters from the light source.
a. What is the intensity of the light falling on the center of the screen?
b. What is the intensity of light falling on the edge of the screen?
Formula:
E = I/d^2
Where :
E = is the intensity of the light on the object,
lux (lx) or foot candle
I = is the intensity of the light at the source,
lumen (lm)
d = is the distance of the light source from the object,
meters or ft.
Example Problem
1. If the magazine is 2m from the 100 lumen source, what is the intensity of the light failing on the
magazine?
E = I/d2
E = 100/22
E = 25 lux
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