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12: Virtual Telescope I: Galilean - arachnoid.com
https://arachnoid.com/raytracing/telescope1.html
Galileo and the telescope – Explaining Science
https://explainingscience.org/2018/03/13/galileo-and-the-telescope/
To calculate the magnification of a Galilean telescope, we divide the focal length of the objective by the focal length of the eyepiece. So, if the …
Galilean Telescope | Taylor Optics Digest
https://taylortechassoc.com/?page_id=982
The Galilean, an afocal unit, introduces no change in focus to the following optics. The “Galilean” comprises a negative “eye lens” and positive objective lens as shown in the thin-lens diagram above. Magnification is the ratio of the focal …
Galilean telescope | Britannica
https://www.britannica.com/science/Galilean-telescope
Galilean telescope, instrument for viewing distant objects, named after the great Italian scientist Galileo Galilei (1564–1642), who first constructed one in 1609. With it, he discovered Jupiter’s four largest satellites, spots on the Sun, phases …
Application of Ray Tracing to Telescopes
https://inst.eecs.berkeley.edu/~ee119/sp09/Section/TelescopeRayTracing.pdf
Ray tracing matrix for telescope An elegant way to calculate a lot of di erent properties of a telescope is to nd its transfer matrix. In gure 1 we have four vectors. (r1 1) is the vector of light coming in to the objective lens, and (r3 3) is the vector of light coming out of the eyepiece. The transfer matrix for a thin
Galileo's telescope - How it works
https://brunelleschi.imss.fi.it/esplora/cannocchiale/dswmedia/esplora/eesplora2.html
The Galilean telescope, although it furnishes erect images with the aid of erector devices, has the severe drawback of an extremely narrow field of view (which makes it, in practice, usable only for magnifications up to around thirty). The principle of operation of the Keplerian telescope (fig. 2) is relatively simple.
Refractive Telescopes - Georgia State University
http://hyperphysics.phy-astr.gsu.edu/hbase/geoopt/teles.html
Galilean Telescope. The Galilean or terrestrial telescope uses a positive objective and a negative eyepiece. It gives erect images and is shorter than the astronomical telescope with the same power. It's angular magnification is -f o /f e.. The image below shows parallel rays from two helium-neon lasers passing through a Galilean telescope made from an objective with f=30cm …
13: Virtual Telescope II: Cassegrain - arachnoid.com
https://arachnoid.com/raytracing/telescope2.html
Light from a viewed object enters from the right, passing through a glass plate, is reflected from a large parabolic mirror at the left end of the tube, is reflected once again from a smaller spherical mirror at the right, comes to a focus near the eyepiece lens at left center, and is presented to the viewer by way of the eyepiece lens.
L-5 TELESCOPES - Lock Haven University
https://www.lockhaven.edu/~dsimanek/scenario/labman3/telescop.htm
Set up the astronomical telescope, and focus it on a distant object seen through the window. Place a screen or white paper where the light emerges from the eyelens, and move the screen back and forth until you observe the smallest size bright circle on the screen. You will not see detail in the circle, but its edges will be relatively sharp.
FOV for galilean vs keplerian telescope - Physics Forums
https://www.physicsforums.com/threads/fov-for-galilean-vs-keplerian-telescope.698788/
If you look towards the bottom you will see some ray tracing with an arrow pointing to the galilean design. It appears that the smaller field of view is due to the light coming out of the eyepiece the opposite way that it does using a normal eyepiece.
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