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gregorian telescope; Kepler telescope; newtonian telescope See telescope. reflecting telescope A telescope that uses a concave mirror as the objective. refracting telescope A telescope that uses a positive lens system as the objective. reverse telescope See visual expander field. terrestrial telescope A telescope that provides an erect image of a distant object. The image is usually erected by means of a lens system placed between the objective and the eyepiece.
There are two main types of telescopes: reflecting telescopes and refracting telescopes. Remember how the telescope does it job by gathering light? Well, each of these telescopes gather the light in a different way.