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A refracting telescope (also called a refractor) is a type of optical telescope that uses a lens as its objective to form an image (also referred to a dioptric telescope).The refracting telescope design was originally used in spy glasses and astronomical telescopes but is also used for long focus camera lenses. Currently, the largest refracting telescope is the 40-inch refractor at Yerkes Observatory in Wisconsin. Refracting and Reflecting Telescopes. Figure 4. Light enters a refracting telescope through a lens at the upper end, which focuses the light near the bottom of the telescope. An eyepiece then magnifies the image so that it can be viewed by ... Telescope aperture is often reported in units of inches or millimeters. One inch equals 25.4 mm. For convenience, you can round that to 25. So if you think of a 4-inch aperture as 100 mm, you will be close enough for this discussion. What is A Refractor Telescope? A refractor telescope has a curved lens on the front.