😎The history of the telescope can be traced to before the invention of the earliest known telescope, which appeared in 1608 in the Netherlands, when a patent was submitted by Hans Lippershey, an eyeglass maker. Wikipedia Optical telescopes Optical foundations The invention of the use of concave lenses to correct near-sightedness is ascribed to Nicholas of Cusa in 1451. He was a German Catholic bishop and polymath.😎
How to make a very simple telescope. Visit any shop which sells eye glasses. Buy two lenses. First is plus 1.00 spherical. Call this objective lens. Second is plus 7.00 spherical or higher power. Even plus 13 is also available. Call this eyepiece lens. Next visit any book shop. Buy 4 black chart papers. More if required later. Also get a pair of scissors and black electrical tape. Roll one chart paper into a pipe. Inner hole of this pipe should be smaller than objective lens. Secure the pipe with tape so it doesnt open up. Place objective lens next to one end of this pipe. Secure the lens to the pipe with tape. Roll another chart paper into a tube. Its inner hole should be smaller than the eyepiece lens. Secure this pipe with tape as before. Place eyepiece lens next to one end of this pipe and secure it to the pipe with tape. You can see that eyepiece lens tube will have smaller hole than objective lens tube. Insert open end of smaller tube into open end of larger tube. There will be a gap between the tubes and they will not fit nicely. We want them to fit nicely and also slide with some friction. Take out the smaller tube. Make it thicker by wrapping 2 or more chart papers on it, each secured with tape. Keep increasing thickness of smaller tube until it nicely and somewhat tightly fits into the larger tube and also slides in and out. Telescope is now complete.
