Results 1 to 2 of 2

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

  1. #1

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

    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.

  2. #2
    Elite Member stapel's Avatar
    Join Date
    Feb 2004
    Posts
    15,661

    Cool

    Quote Originally Posted by CigmaChi View Post
    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!

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •