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prime focus |
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prime focus [′prīm ′fō·kəs] (optics) The position in a reflecting telescope at which light from celestial objects is focused by the main mirror, located on the axis of the mirror near the open end of the tube. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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