Telescope Mirror It is worth to buy a telescope with a pyrex mirror ?
It will cost me more but if it is really necessary I can make the effort.
If I don't spend money on pyrex mirror I will buy some accessories for the telescope...some filters and maybe an 2mm eyepiece.
pls help
If your choices are:
a. pyrex mirror
b. super high magnification eyepiece
c. colored filters
- then I would definitely favor the pyrex mirror. I rarely use high magnification, I never use colored filters, and I rarely use my more expensive Olll filter. But the mirror is sort of fundamental and is used every time you look through the scope. Stick with the basics first.
Secondary Mirror Are there any free programs that will allow me to clone or mirror my primary monitor onto my secondary one?
I need to do a conference meeting and I want the notetaker to type the notes on Word. I was hoping that we'd all be able to see what they were typing by mirroring/cloning the primary (laptop) monitor onto the secondary monitor.
I have seen software online, however I am very poor right now (I'm a typical college student). I was hoping someone could point me towards a free program.
I am not looking for any hardware, as I do know that exists yet I do not really want to buy any of it also.
THANKS SO MUCH!!!!
Sorry, I have an Acer laptop
If what you mean by "primary" monitor is the LCD panel on the laptop and "secondary" to be a monitor connected by the VGA/DVI port on the back of the laptop, then that should be possible just with the drivers for the laptop. My Dell has a button on the keyboard I can press to cycle between just the panel, both panel and VGA-out, and VGA-out only. My laptop at work has that option as well as a screen in the display settings for setting up the behavior of the panel and attached monitor. For example, I can either clone them or use the second monitor as a second desktop.
Why do the things in the way of the light doesnt make spots when you look in the telescope of a telescope ?
the things that support the secondary mirror is in the way of the light, so why doesn't it affect the final image???
Heres what i meant to say..
Why do the things in the way of the light doesn't make spots when you look in the telescope?
Because they are so out of focus close to the focal plane they do not appear at all normally.
The things are in fact called secondary mirrors in the case of reflectors (mirrors), and in the case of refractors (lenses), they have no obstructions in the focal light cone at all.
The only effect of the secondary mirror, and its supports is to reduce contrast somewhat, but because these reflecting telescopes are so much cheaper to manufacture than refractors, which have much better contrast, this is acceptable to most astronomers, provided the mirror is well made.
Mirror Telescopes What is the diameter of the image of Mars formed by a telescope mirror w/ focal length of 1.75m (see details)?
The diameter of Mars is 6794 km, and its minimum distance from the earth is 5.58x10^7 km. (NOTE: A telescope mirror is convex.)
Assume that the planet is on the optical axis of the mirror. Rays from the extreme edges of the planet to the centre point of the mirror will form a triangle which is similar to that formed by the reflected rays which then pass on to the extreme edges of the image. So the ratio of the diameter of Mars to its distance from the telescope is the same as that of the diameter of the image (d) to the focal length of the mirror. we can write -
d/1.75 = 6794/5.58*10^7
d = 1.75*6794/5.58x10^7 = 213*10^-6m
Note - the mirrors of astronomical telescopes are concave.
Ok I have the concave glass with the sagita and with the focal length, but just the glass. Now I need to help me and answer me how I will make the glass to reflect from the sagita.I need to know what is the chemicals to make the mirror (the reflecting part).It is probably some aluminium fluid but I don't know what exactly. Please help me and tell me the process...
You have already hogged the glass out? Use finer and finer abrasives to smooth the glass. Then polish the glass with rouge or cerium oxide. Make a Foucault tester. Then figure the spheroid or paraboloid. Then have it coated with aluminum by a commercial firm or a club. The Washington and the St Petersburg clubs do mirror-coating.
The glass, and grinding and polishing materials are sold by Newport Glass Works, Salem, GotGrit, and Willmann-Bell.
NGW has some prices at its website. The website also gives some instructions on mirror making.
There are about 30 mirror-making groups/classes/workshops. Some are listed at the Stellafane website.
There is a telescope making Yahoo! webgroup called "make_your_own_telescope".
Mirror Telescopes Do i need a special type of mirror to build my own telescope?
I want to build my own telescope and i have notice that some shaving mirrors are of a size (10"-12") that would be ideal but do i have to have a mirror to certain specifications in terms of concave/convex curvature and magnification. Any additional info for self build of a telescope would be appreciated.
Barry,
It would be nice if a shaving mirror were a good shortcut for a telescope, but the quality is just not there!
Here are some things to understand, and you will see why:
An astronomical telescope has to focus *all* light coming from a particular point in space (like a star or a single spot on the moon) to a single point at the eyepiece of your telescope. This is generally done with a system of mirrors, lenses, or both to make up your telescope.
The simplest type of mirror telescope (sometimes called a "Newtonian," as Isaac Newton described the optics and built several of these) consists of a single curved mirror to focus the light to a point, and a smaller flat mirror to bring the focused light outside the telescope tube to an eyepiece, where it is focused for your eye.
A Newtonian scope uses a mirror shaped as a parabola (usually by grinding high-quality glass flats, and coated on the parabolic surface - the *front* surface of the mirror. The parabolic shape is required to bring all the light to a single focus, and the front surface is required to avoid reflection and refraction of the incoming light, which would degrade the image and cause different colors to focus in different places.
Your shaving mirror is almost certainly spherical, and has the coating on the back. It also probably is only a vague approximation of spherical, since it is mass produced by stamping out plastic. You would be very unsatisfied with the image you got from it, which would have a bunch of aberrations, including astigmatism, coma, and chromatic aberrations.
If you are interested in more details on this subject, look for a good basic book on building a telescope, which will go into a lot of details on what you are trying to do. If I were you, I would start with a much smaller scope (4 to 6 inches) and either find a local ATM (amateur telescope making) mirror-grinding workshop or buy an already ground and polished mirror from a telescope supplier. I think you will find enough work in assembling a basic scope and in aligning the parts to give you a decent image that you might avoid mirror grinding for your first project.
Good luck, and ask more questions if you want more details!
What are the advantages of mirrored telescopes, as apposed to lenses?
the answers can range from quality to scientific reasons
First, mirrors are easier to make than lenses. A mirror has one surface that needs to be shaped to optical precision, while a lens has two surfaces for each element (telescope objectives typically consist of two or three separate lens elements). This makes mirrors much less expensive than lenses for a given aperture. Second, lenses have to be optically perfect inside and out, while mirrors need only that one perfect surface. The largest refracting telescope in the world (40 inches/1meter) is over a century old; nobody has bothered to make a bigger piece of perfect glass since, while reflectors have been built with diameters over 400 inches/10 meters.
A third reason relates back to a mirror only needing a single surface. With the right structural support, a mirror can be very thin and lightweight, making it ideal for space-based telescopes.
Secondary Mirror I'm looking for a book I read in secondary school, but I cannot remember the title or the author.?
How can I go about finding this information?
The book was about a female student who has an affair with her English teacher. I remember that they were studying Romeo and Juliet at the time, and their affair sort of mirrored the play. I also remember it being more mature than I had been expecting to find at school because the sex scenes were quite detailed. If this sounds familiar, or if anyone knows where I might have more luck finding this book please let me know!
Teach Me by RA Nelson?
Carolina is a high-school senior who feels she is too smart and mature for small-town Alabama life. Then she meets Mr. Mann, the new language arts teacher who is obsessed with Emily Dickinson. After she makes him feel at ease in his new job, she feels he is worthy of her attention, and the two begin an intense, clandestine affair, which is consummated on her 18th birthday. The love ends devastatingly for the teen when Mr. Mann suddenly dumps her and quickly marries another woman right before graduation. Carolina finally confides in her best friend, Schuyler, and he helps her try to figure out who Mr. Mann is and why he acted as he did. Nelson's writing is wonderfully eloquent and full of poetic references and wry humor, yet the plot and characters are occasionally chaotic. It is difficult to identify with Carolina, who not only thinks she's better than everyone else, but also goes to extreme lengths to seek revenge on her former lover. Mr. Mann is no more sympathetic.
Also check Secrets of the Morning by VC Andrews where a girl named Dawn has an affair with her teacher and becomes pregnant.
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is there a job market for self taught scientist?
so many places assume your secondary education mirrors the amount of information you hold, but here so many self taught individuals that know as much as a Harvard grad without ever going to any college. this is rare like Mr. clean with hair, but is still common.
Sure, if you can provide peer reviewable documentation of your discoveries no one will really care what your education is...
