Glossary
- astronomical telescope An instrument used to observe celestial bodies. Larger astronomical telescopes use mirrors instead of refracting lenses.
- telescope An afocal optical device made up of lenses or mirrors, usually with a magnification greater than unity, that renders distant objects more distinct, by enlarging their images on the retina.
- line of sight The line of vision; the optical axis of a telescope or other observation system. The straight line connecting the object and the objective lens of the viewing device.
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