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Glossary of Terms > O

Optical fibre

A glass or polymer fibre through which light can be guided. Uses total internal reflection to minimise light loss.


The path an object makes around another object while under the influence of a source of centripetal force eg. gravity.


Equipment used to show the positions, motions, and phases of the planets, satellites etc in the solar system. Click here for the Astronomy Models equipment page.


To swing to and fro like a pendulum.


A test device that uses a cathode-ray tube or similart to depict on a screen changes in an electric quantity, as voltage or current.