ECE532 Biomedical Optics
© 1998 Steven L. Jacques, Scott A. Prahl
Oregon Graduate Institute

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?

The geometry of the problem is:

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