I am looking for a mirror sphere made up of a single piece. Anyone knows if it exists? Thanks!?
535706
Buy a sphere of pure aluminum and start polishing it with increasingly higher grit sand paper (until you get up to around 2000 grit or so).  Then use some Mother's Polish to get it to a fine mirror shine.  There you go, a mirror sphere.  \n\nHowever, I think you are going to be quite disappointed when you get this object in your possession.
627749
The easy answer is no. The pieces that the sphere would have to be split into would not be physically possible. The proof itself depends on the axiom of choice. In fact, there are models of set theory that don't have the axiom of choice where the Banach-Tarski paradox cannot happen. This shows that an infinite number of choices is needed, which demonstrates the physical impossibility.
996119
Nice to see an Indian on here!! I'm an Indian too! Maharashtrian and mainly from Pune city. Yeah, you can get telescopes in India and the prices do vary dependent upon the power it has. An average telescope that can allow you to study the solar system in a glance is available at Rs. 7000. I saw one in an exhibiton, but sorry can't really specify where you can get it. Give me your mail id and if i find anyone selling it, I'll give you the whole details. why don't you make one?? that's a great idea, cause i have made one myself that is as cheap as Rs. 500!!
601884
mirror is designed to reflect the light and no refraction light .. from it .. so the reflection angel will be zero
816306
What do you need?  There are several types.  Newtonians, invented be Isaac Newton in 1673.  They have a primary mirror with a parabolic shape whose size is what is quoted when the telescope's size is mentioned.  The secondary mirror is small, flat, and angled to send the image to an eyepiece (or camera) mounted on the side of the tube.\nThe Cassegrainian (invented by Cassegrain!) has a hole in the primary mirror, and the image is reflected by the secondary through the hole to the eyepiece mounted on the end of the tube.  Most large reflectors today are this type.\nCoude' (from the French for elbow, not the inventor's name) has three mirrors, and the image is sent off to the side.\nSchmidt or Maksutov (invented during World War 2) has a lens at the top of the tube, plus the mirrors usually in the Cassegrain arrangement.\nNewtonians tend to be cheapest, Schmidt/Maksutov the most expensive.\nCheck wikipedia under each name for more details.
120576
Instead of getting such huge mirrors, you might be better off buying some 12" square mirror tiles and use them to make whatever size mirror you need. Admittedly they will show the seams between tiles, but they will be considerably less expensive and easier to obtain than mirrors of the size you are writing about.
175371
I would suggest purchasing this fine model listed in the below source, if you have the money to do so (the painted plastic one, first one listed).  It is a bit expensive, but it is really the best I know of since it actually shows all the atoms and is quite accurate.  It comes with instructions and even tells you how to paint it.  I actually teach with this exact model.  If you don't have money to purchase that model, it is possible to make it yourself using your own materials, but I would use the photos of this model as a guide to how to go about doing it.  It really depends on what you need it for and how detailed you need it to be.
904712
Try this: http://worldwind.arc.nasa.gov/ it's made by Nasa and is hot!!
8756
Unless the reflective surface is perfect (which is impossible in the real world) the light will loose a little energy with each reflection (the mirror will heat up a little), and in a very short time the light will just get redder until it is merged into whatever infrared energy is inside the sphere.
990247
A sphere.  It has an inside and an outside.
1150032
It is hard to imagine a source of light that would not become an obstacle for light inside when shut off, however lets scale this up, make the box one light minute across and make the light source a bright laser that destroys itself by lasing...\n\nIn that case the beam would bounce around forever, assuming that the reflective surface is perfect in its mirror behavior.  \n\nSo if we imagine a perfect mirror then the light will continue to bounce forever.  However one might need to look carefully at the corners of the interior, if the light reflects back and forth in a corner it may get trapped in a standing wave.  \n\nIn the best versions of this experiment I can imagine the energy would be rapidly shifted out of the visible light spectrum's and lost as heat.
748030
you mean like a shadow box or display case?  try Doll collector stores.  they might have something in the right dimensions.  or have one custom built.
1035044
What a dope, actually this already exists.  It’s called the Focal Light Projector; also more subclassfactions of this marvel is Particle Light Projector, and the Vaporizer Particle Projector.
629338
i saw a show once on these old mysterious structures. they had a map of the world and all of these structures were marked on the map. I couldn't believe what I saw… it formed a circle, actually two circles. The inner circle (dots) were exactly spaced between the dots of the upper circle.\n\nIt's hard to explain but what I saw was this... instead of drawing a circle around you would connect by going down then back up (like the letter V), down then back up, over and over again in a clockwise fashion. If you can envision what I am saying it turned out to be like a pie cut into several times…an arrow pointing to the middle!(no dot in the middle)\n\nI was screaming at the tv saying can't you see it, aren't you going to point it out? Nothing was said!!!\nI don't remember what show it was and I didn't have enough time to exactly see where it was pointing to.\nI wonder what mystery could be found in the center of that map?\n\nHas anyone else seen this????\n\nI just searched the web for an image to help visualy. looks something like the image in the link below.
603186
Any material which may have a reflective surface may be said to be a mirror when it does -- be that a silver-backed glass mirror in the Versailles Salon de Glaces, a sheet of gold leaf on the ceiling of Catherine's boudoir in the Winter Palace, the polished bronze shield which allowed Perseus to see not Medusa but her reflection, an ancient Egyptian obsidian obelisk, the Reflecting Pool on the National Mall, the cornea of the human eye...
259893
It cant be just any piece of glass, it has to be a prism. The light comes out in the form of a rainbow because the prism separates the light into it's visible colors.
918902
that is a paradox.  such an object can not exist.  i have a story for you:\n\nWise teacher was asked by an unbeliever, can God make the whole world small enough to fit into an egg?  Wise teacher said "come with me".  The two men went outside and climbed to the top of the mountain.  Wise teacher asked "what do you see?"  Unbeliever said "I see mountains, rivers, trees. . . I feel like I can see the whole world from here."  \n\nWise teacher said "See?  God can fit the whole world into your eyeball, which is smaller than an egg."