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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.
Refraction of light. Refraction. refracted ray. angle of refraction. index of refraction. the bending of light as it travels, at an angle, from a materiâ¦. the ray that is bent upon entering a second medium. the angle between the normal and a refracted ray. the ratio of the speed of light in a vacuum to the speed of liâ¦. Refraction. the bending of light as it travels, at an angle, from a materiâ¦.