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Oil Spot Photometer

Greased lighting

Published:   February 22, 2016
Total Running Time:   00:05:20

A smear of oil on a white card becomes a powerful tool for comparing the brightness of two light sources, including the sun. Learn how to make your own oil spot photometer and some interesting experiments to try.

© 2017 Exploratorium. Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

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