EXAMPLE:

Irradiance of a flashlight

Consider again our cheap flashlight example.

The flashlight projects a beam that is 200 mW to create a 10-cm-diameter spot on a wall 25 cm meters away. What is the irradiance at the wall?


to next page | back to Irradiance | back to 1. Radiometry | ECE 532 | OGI Optics Courses | OMLC homepage.