Geometry: A single LED bulb illuminates light from a single point in all directions.

CigmaChi

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Oct 16, 2016
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This a question I am having a hard time with on a PSAT review.

A single LED bulb illuminates light from a single point in all directions.

There is an 12" x 18" screen with its center point exactly 4 feet to the right of the LED bulb and 8 feet back (away).

What percentage of overall light from the LED is hitting the screen and what percentage of light is not. Both numbers must total 100%.

Please help been stumped for days.
 
A single LED bulb illuminates light from a single point in all directions.

There is an 12" x 18" screen with its center point exactly 4 feet to the right of the LED bulb and 8 feet back (away).
In what manner is the center "exactly 4 feet to the right of" and also "8 feet away from" the bulb? Is there maybe a drawing that goes with this exercise?

Thank you! ;)
 
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