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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.
e. to account for the motion of objects in the sky as a result of the Earthâs rotation. 29. Radio telescopes are _______ telescopes. * a. Reflecting b. Refracting c. Deflecting d. Compound e. Retracting 30. A telescope whose objective is a lens and contains no mirrors is a(n) _____ telescope. * a. Refracting b. Reflecting c. Deflecting d. Compound e. Retracting 31. In a reflecting telescope the objective is a ____. a. prism * b. mirror c. lens d. diffraction grating e. photographic plate 32. Which has the larger light-gathering power? a. A telescope of 5 cm diameter and focal length of 50 cm. * b. A telescope of 6 cm diameter and focal length of 100 cm. c. A telescope of 2 cm diameter and focal length of 100 cm. d. A telescope of 3 cm diameter and focal length of 75 cm. e. Both b and c since they have the same focal length 33. The resolving power of a telescope is _____.