Slide the two cardboard tubes in and out until you have a clear image. Look through the eyepiece of your telescope and focus it on a distant object. You have now assembled a simple refracting telescope. Glue the other framed lens to the end of the larger tube.ģ. Glue that framed lens to the end of the smaller tube. The shorter focal length lens will be theĮyepiece. Glue the lenses to the center of the frame. With a knife, cut out circles that are slightly smaller than the diameter of the lenses in the center of the paper frame circle. These circle frames will mount and center the lenses on the tube. Use the scissors to cut out two circles from the manila paper that are the same size as the diameter of the mailing tube. Cut both of the tubes to that length with a knife or saw.Ģ. Divide that length by two and then add another inch. Add the value of the focal lengths of the short and long lens together. The length of the assembled telescope will be a little longer than the sum of the focal lengths of the two lenses. The mailing tubes will be the body of the telescope with the smaller one sliding inside the larger one. This telescope will be constructed using the same lenses that were used in the experiment named, "Focusing Light With a Lens," page 49 in the Educator Guide: Optics - Light, Color and their Uses.ġ. The magnification of the telescope can be found by dividing the focal length of the objective by the focal length of the eyepiece. The eyepiece acts as a magnifier and enlarges that image. Light from a distant object is focused by the objective lens to form an image in front of the eyepiece. The lens at the other end of the telescope is called the objective lens. In a telescope, the lens held next to your eye is called the eyepiece and is usually a short focal length lens or a combination of lenses. The student will construct a simple refracting telescope and calculate the magnification.
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