 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
Natural Science Forum / Physics / Relativity / September 2005Dumb(Probably obvious) Light Speed Question
Hi, I have a quick question. Forgive my ignorance. I had originally typed up a big question, but I'll just make it simple so I don't lead anyone to one train of thought. What happens when a mirror is moving at .5c from earth(ignoring rotation), and we are watching the mirror from earth, what would the reflection be like? Theoretically of course. > Hi, I have a quick question. Forgive my ignorance. I had originally > typed up a big question, but I'll just make it simple so I don't lead > anyone to one train of thought. What happens when a mirror is moving at > .5c from earth(ignoring rotation), and we are watching the mirror from > earth, what would the reflection be like? Theoretically of course. What kind of mirror? << CVI Optical Components: Optics - mirrors, dielectric, hot, cold CVI Optical Components offers a variety of dielectric mirrors with high laser ... Dielectirc mirrors Hot & cold mirrors. Transparent- conductive (ITO) ... www.ocioptics.com/dielmir.html - 11k - Cached - Similar pages AFOSR: Research Highlights - January / February 1999 Dielectric mirrors, unlike metals, are not conductive and therefore reflect light more efficiently. Light travels in dielectric materials at speeds that are ... www.afosr.af.mil/pages/afrrhjan.htm - 45k - Cached - Similar pages "Perfect" Mirror Design Technology Dielectric mirrors, unlike metals, are not conductive and, therefore, reflect light more efficiently. Light travels in dielectric materials at speeds that ... www.afrlhorizons.com/Briefs/0001/OSR9904.html - 7k - Sep 27, 2005 - Cached - Similar pages >> http://www.google.com/search? ©2005 Google hl=en&q=dielectric+conductive+mirror&btnG=Google+Search Sue... Well, I hadn't thought about the fact that mirror tyoe could affect the outcome, although it seems obvious now, a friend has been arguing with me about this so...for the sake of science lets say a "perfect" mirror. However, how do these mirrors affect the speed of the light being reflected? Lots? A little? (Relatively speaking). > Well, I hadn't thought about the fact that mirror tyoe could affect the > outcome, although it seems obvious now, Most folks don't. > a friend has been arguing with > me about this so...for the sake of science lets say a "perfect" mirror. That would be a dielectric mirror if we go purely on the way that MIT labels their work. :o) > However, how do these mirrors affect the speed of the light being > reflected? Lots? A little? (Relatively speaking). They affect it only a little and only in the nearfield, a few wavelenghts from the mirror. http://www.conformity.com/0102reflectionsfig3.gif The reflection will be redder and each sucessive echo will be longer. If that doesn't settle the issue, then you might need to be give a few more details. Sue... | Well, I hadn't thought about the fact that mirror tyoe could affect the | outcome, It doesn't. Sue can't answer any question without referring to some irrelevant web page, then she doesn't read it herself. Androcles although it seems obvious now, a friend has been arguing with | me about this so...for the sake of science lets say a "perfect" mirror. | However, how do these mirrors affect the speed of the light being | reflected? Lots? A little? (Relatively speaking). | Hi, I have a quick question. Forgive my ignorance. I had originally | typed up a big question, but I'll just make it simple so I don't lead | anyone to one train of thought. What happens when a mirror is moving at | .5c from earth(ignoring rotation), and we are watching the mirror from | earth, what would the reflection be like? Theoretically of course. By the PoR, the Earth is moving away from the mirror. Androcles. > | Hi, I have a quick question. Forgive my ignorance. I had originally > | typed up a big question, but I'll just make it simple so I don't lead [quoted text clipped - 4 lines] > > By the PoR, the Earth is moving away from the mirror. ...and it seems to be traveling with company: http://odin.gi.alaska.edu/FAQ/e2.gif Sue... > Androcles. | > | Hi, I have a quick question. Forgive my ignorance. I had originally | > | typed up a big question, but I'll just make it simple so I don't lead [quoted text clipped - 7 lines] | ...and it seems to be traveling with company: | http://odin.gi.alaska.edu/FAQ/e2.gif I dunno what that hairy orange/black ball is, but: http://sohowww.nascom.nasa.gov/data/realtime-images.html Androcles. | Sue... | | > Androcles. > Hi, I have a quick question. Forgive my ignorance. I had originally > typed up a big question, but I'll just make it simple so I don't lead > anyone to one train of thought. What happens when a mirror is moving at > .5c from earth(ignoring rotation), and we are watching the mirror from > earth, what would the reflection be like? Theoretically of course. If you would send out two light signals with 1 second between them, then you would see the reflections with (1+v/c)/(1-v/c) seconds between them, which, for your v/c = 1/2, amounts to 3 seconds. So the frequency of light would be divided by 3 and the wavelength multiplied by 3. Since the wavelengths of visible light lie somewhere between 390 nm and 750 nm, we wouldn't see any of that anymore. The only stuff we would be able to see in the mirror, is the radiation we send out in the ultraviolet band somewhere between 130 and 250 (and that also manages to make its way through the atmosphere), because that would be shifted right into our visible window. Dirk Vdm > Hi, I have a quick question. Forgive my ignorance. I had originally > typed up a big question, but I'll just make it simple so I don't lead > anyone to one train of thought. What happens when a mirror is moving at > .5c from earth(ignoring rotation), and we are watching the mirror from > earth, what would the reflection be like? Theoretically of course. If you would send out two light signals with 1 second between them, then you would see the reflections with (1+v/c)/(1-v/c) seconds between them, which, for your v/c = 1/2, amounts to 3 seconds. So the frequency of light would be divided by 3 and the wavelength multiplied by 3. Since the wavelengths of visible light lie somewhere between 390 nm and 750 nm, we wouldn't see any of that anymore. The only stuff we would be able to see in the mirror, is the radiation we send out in the ultraviolet band somewhere between 130 and 250 (and that also manages to make its way through the atmosphere), because that would be shifted right into our visible window. Dirk Vdm |
Reply to this Message |
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2009 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.