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).
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.