Stuck in someone else's frames? break free!
A REFRACTING TELESCOPE
Let's make a refracting telescope. Piece-o-cake.
lenses, one with a long focal length (about 8
small (thicker) lens (the eyepiece) close to your
When the room is in focus, ask another student or the teacher to measure the distance between the two lenses. This will help determine the overall length of your telescope.
Cut a length of cardboard tubing, such as a mailing tube, in half. This brilliant writer wonders if you could use two paper-towel rollers? Slit one section lengthwise and remove a 1/4 inch strip down the side, so that by squeezing and taping it closed, this half of the tube is slightly smaller (skinnier) than the other half.
Both sections can be wrapped with masking tape to make them sturdier, but be sure the smaller tube slides easily into the larger tube. The smaller tube will hold the eyepiece lens at the near end, and the larger tube will hold the objective lens at the far end.
Cut two rings
of cardboard for each of the two ends of the
lenses to the tube sections. The fit should make
through the eyepiece lens and moving the smaller
Any problems with this page? Send URL to webmaster. Thank you!
We publish two newsletters a couple of times a month. To subscribe, send a blank email to the appropriate email address. Topica will send you a message asking if you really intended to subscribe - just click reply - that's it!
Free Recipe Collection Newsletter:
Jewish Recipe Collection Newsletter:
Tired of Geek Speak when