Talk:Parabolic reflector

message: Maybe more practical uses and images should be added.
Such as how Archimedes used mirrors in a parabolic path to catch invading Roman ships on fire, solar ovens, etc.
I was looking for more information on how parabolic reflectors create a virtual image as seen in the wok pan illusion.  Any explanation or diagrams of this?
::This is interesting appropedia:Aleiha's parabolic solar cooker. Bawolff 00:52, 7 February 2007 (UTC)
thread_title:  Practical Uses 

message: I'm sorry to say, but the figure :Image:Parabolic reflection 1.svg is just terrible. While it expresses the general idea of the parabolic reflector, the position of the focal point is such that the law of reflection is painfully disobeyed, with the reflected ray on the same side  of the normal as the incoming ray. A similar problem appears in :Image:Waves reflecting from a curved mirror.PNG (which now I notice was drawn by the same user). — AdiJapan ☎ 11:45, 13 June 2008 (UTC)
replies: text: I agree. I have proposed deletion of both images. Inaccurate illustrations of technical subjects are worse than useless.--Srleffler (talk) 04:54, 11 November 2008 (UTC)
thread_title: Figure

message: A possibly useful reference for this article: 
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This appears to be an early effort at the manufacture of a large non-spherical reflector. --Srleffler (talk) 04:57, 11 November 2008 (UTC)
thread_title:  Useful reference? 

message: Their size and lack of electricity means that solar cookers and solar furnaces have problems tracking the sun.  (Solar cookers are frequently adjusted by hand every few minutes.)  By using a much deeper bowl and a more complex shape the sun can be with in 30o or 45o of the centre of the mirror.  The Compound Parabolic shape is made by merging two parabolas with the same focal point.
Compound Parabolic Mirror video
Andrew Swallow (talk) 07:15, 1 June 2009 (UTC)
thread_title:  Reducing tracking problems by using a Compound Parabolic Mirror 

message: This might be a good reference link to real-world applications of the paraboloid algorithm, but I leave it to more learned minds to decide: http://www.freeantennas.com/projects/template/
--Roland (talk) 18:58, 21 November 2011 (UTC)
thread_title:  Possible Application? 

message: Probably worth adding something about off-axis parabolic reflectors .  The focal point of a full paraboloidal mirror lies in the path of the incident collimated beam, meaning that a receiver/detector placed at this point will block part of the incident energy.  The figure in the article illustrates how an off-axis paraboloid (i.e., a section of a full parabolic reflector) focuses radiation to a point outside the incident beam, meaning that the detector does not cast a shadow. 
Separate article perhaps... or is that overkill? Papa November (talk) 10:45, 17 May 2013 (UTC)
replies: text: It's mentioned in the Rotating furnace article, about making parabolic reflectors by rotating molten glass. Off-axis reflectors are made by rotating the container of glass about an axis that does not pass through it. `DOwenWilliams (talk) 21:30, 17 May 2013 (UTC)
replies: text: Ok. I've added a few lines about off-axis reflectors. DOwenWilliams (talk) 01:39, 18 May 2013 (UTC)
replies: text:  Great! Thanks :) Papa November (talk) 16:21, 20 May 2013 (UTC)
thread_title:  Off-axis parabolic mirrors 

message: I reverted your title change  Parabolic reflector → Parabolic Reflector because article titles that are common nouns are written in sentence case, meaning only the first letter is capitalized. See MOS:TITLECASE. All the best. --ChetvornoTALK 07:53, 10 November 2017 (UTC)
thread_title:  Recent page move