Optics In The Fishtank
Why is the sky blue? Why are
sunsets red? How does light
travel through optical fibers? To
answer these questions and others,
we brought out a secret weapon: the fishtank. Using a 10-gallon tank ($10) and an inexpensive laser pointer ($40) or a He-Ne laser, a flashlight, and a ruler, we can show many sophisticated effects ranging from waveguiding to Rayleigh scattering.
The OSA student chapter at
Northwestern University has performed these interactive demos at local high schools to encourage
interest in optics.
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