Question

two examples of extended of lights

Answer 1

Answer:

Incandescent bulbs, fluorescent tubes, discharge sources, and light emitting diodes (LEDs) are all examples of extended sources. Extended sources are physically and mathematical- ly different than the point sources commonly used in lens design.

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Answer 2

Answer:

Common examples of extended light sources are the entire sky on an overcast day, the light coming in through an office window (again, on a cloudy day), or a large fluorescent bulb. In these cases, the power of the light emanating from a single infinitesimal point may be considered negligible or even 0.

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