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Isaac Asimov said, “I don’t understand the ecstasy of lens grinding myself, but the history of astronomy is littered with peculiar people who would rather grind lenses than eat.” (Source: “Quasar, Quasar, Burning Bright”, by Isaac Asimov. Doubleday, 1978, p. 196.)
Asimov identifies Alvan Graham Clark as the first notable American lens grinder in a field then dominated by British, French, and German practitioners. However, there doesn’t seem to be any articles in Wikipedia on lens grinding. As far as I can tell, it is only discussed in the article on Baruch Spinoza. Would it fit into the history section here? Psalm 119:105 (talk) 10:46, 24 January 2011 (UTC)Reply
is listed as the Gaussian Lens Formula in my copy of Hecht (Hecht, Optics, 4th edition, 2002, pg. 158), not the thin lens formula. --97.83.155.54 (talk) 10:58, 28 March 2011 (UTC)Reply
It is stated in the article that Archimedes used a "burning glass" which was a biconvex lens. However, most sources state that what was actually used was a series of plane mirrors. A biconvex lens of the scale necessary to burn a hole in a wooden ship would be incredibly difficult to produce in 424 BC, whereas modern replications of the "burning mirror" method have yielded results.
69.110.229.37 (talk) 05:53, 9 June 2011 (UTC) CurtisReply
The "History" section stops at John Dollond in 1758. Obviously there is more that needs to be added. Fountains of Bryn Mawr (talk) 21:50, 8 March 2012 (UTC)Reply
This article is a mess. It's unsuitable for most beginning readers, and is a tiresome repetition of advanced information that would already be understood by people with advanced coursework.
And how many readers will be interested in someone's 600 word shaky historical speculations, following the brief, banal opening?
It's an example of how "committee decisions" of "editors" can be worse than useless, in that they alienate most readers from understanding. The Britiannica does a far better job at describing the topic. This Wikipedia at its most pointless. Except, of course, lengthy articles about pop stars citing fashion magazines. 76.102.1.193 (talk) 05:32, 25 August 2012 (UTC)Reply
The side-by-side diagrams and photos in Lens (optics)#Types of simple lenses are too wide in their tables to fit on mobile devices (typically 320px wide). These should be tweaked so they passively degrade to one-over-the-other on narrow screens; if nobody gets to it, this is a note to myself to poke at it later. :) --brion (talk) 19:15, 24 September 2012 (UTC)Reply
It just appears out of nowhere. Can someone provide the derivation for it? 137.54.11.202 (talk) 05:54, 2 October 2012 (UTC)Reply
After some effort to try to derive the lensmaker's equation I discovered that it is an approximation, be it a very good one under normal circumstances. The approximation used is that d << R1,R2. I recommend that this be included in the description of this variable (d).Gerald Tros (talk) 23:56, 29 December 2012 (UTC)Reply
This article refers to "simple glass meniscal lenses", and gives a date of the 8th Century. This disagrees with 5th Century in the Glasses article. Which is correct? I added [citation needed] to both articles. The other article was uncited. I don't know if the reference here can be looked up or if it includes that information. Thanks! Misty MH (talk) 08:08, 25 July 2013 (UTC)Reply
Hi - I write for Wikiversity mostly, and am trying to bridge the gap between the completeness of many Wikipedia articles and the needs of first and second year college students. I assigned a lab in which the students are asked to verify that this is called the "thin lens formula" after seeing that this name for the formula is omitted on the article Thin lens. Some of my students are beginning to edit, and they will correct this on Thin lens.--Guy vandegrift (talk) 15:57, 16 March 2015 (UTC)Reply
The lens looks like it is evenly thick and would have little or no negative character. It would be better with an illustration where the negative meniscus was clearly thinner in the middle. Jeff tupo (talk) 11:59, 21 April 2015 (UTC)Reply
Done --Guy vandegrift (talk) 13:11, 21 April 2015 (UTC)Reply
Article is currently written in a mixture of different forms of English, against WP:ARTCON. (For example, both centre and center are used in the article, and there are more such examples). Usually, the guideline would be to go back to the original language form used. That would be British English, by the way. However, I'll readily acknowledge that's almost 13 years ago and the article has changed significantly since then, so instead of going boldly ahead, I'm asking here first if anyone has a problem with me bringing the article back into line with British English. Alternatively, if someone has a good reason for this article to use a different variation of English (such as American English) to be used that I have overlooked, please let me know. AddWittyNameHere (talk) 22:36, 1 June 2015 (UTC)Reply
The result of the move request was: not moved. Jenks24 (talk) 11:37, 20 August 2015 (UTC)Reply
– The concept in optics seems to be the primary topic by long-term importance. bd2412 T 14:31, 12 August 2015 (UTC)Reply
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Could one of our resident optics gurus add a paragraph or two about inverted cone lenses? [1][2] Thanks! --Guy Macon (talk) 09:02, 8 March 2016 (UTC)Reply
User:Srleffler, please do not revert edits without giving an edit summary, particularly whe the edit you are reverting did leave a summary.
The issue in question is a grammatical dispute over which form of the possessive to use with a name ending in an s. Should we have:
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Until recently we had Aristophanes'. An IP editor changed it to Aristophanes's with the edit summary "Fixed grammar". I reverted this with the edit summary " was not incorrect, see MOS:POSS, based in pronounciation". Srleffler has re-reverted, without an edit summary.
The guidance in the Wikpedia Manual of Style is at MOS:POSS. This says that there are two accepted styles when forming the possessive of a singular noun ending with one s. One style is to always add 's, the other style is to either add just an apostrophe or to add 's, depending on pronunciation. I favour the second style. It is unclear whether Srleffler favours the first style or if he or she would pronounce this differently.
When using the pronounciation-based style, writing Aristophanes's play implies that it is pronounced "Aris-to-fa-nees-es play". I would say "Aris-to-fa-nees play", so I would write Aristophanes' play. However, I would write "keeping up with the Jones's".
I am not attempting to impose my style on Wikipedia, but to resist "grammatical corrections" of things that are not incorrect. I will re-revert. Verbcatcher (talk) 02:07, 4 June 2017 (UTC)Reply
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"In the extreme case where an object is an infinite distance away, S1 = ∞, S2 = f and M = −f/∞= 0, indicating that the object would be imaged to a single point in the focal plane. In fact, the diameter of the projected spot is not actually zero, since diffraction places a lower limit on the size of the point spread function. This is called the diffraction limit."
There is a limit, but it is not zero. Right. I think this needs to be rewritten. It is certainly not an "extreme case" to not be able to see objects until you approach them... Try looking out in your garden and see if you can see the insects until you approach them or if you don't have a garden place something that doesnt diffract too much on the ground in a parking garage and see if you can see it as you move away from it... It is really true. Things disappear with distance. It's amazing i know. — Preceding unsigned comment added by 80.212.223.246 (talk) 09:36, 14 June 2018 (UTC)Reply
The result of the move request was: consensus against this proposed move. DrKay (talk) 18:55, 8 August 2019 (UTC)Reply
Lens (optics) → Optical lens – Natural disambiguation is preferred over parenthetical disambiguation. Interstellarity (talk) 18:36, 22 July 2019 (UTC)Reply
The result of the move request was: Moved. This is the primary topic and a Broad-concept article.(non-admin closure) Cwmhiraeth (talk) 10:23, 21 August 2019 (UTC)Reply
– Some support for this move in the requested move discussion of 22 July 2019, opening for re-listed discussion. DrKay (talk) 18:55, 8 August 2019 (UTC)Reply
what is the correct distances and adjusting to be able create your own properly ?
Uses of lenses 182.182.71.136 (talk) 19:43, 27 April 2022 (UTC)Reply
As above 12.199.163.10 (talk) 17:17, 8 June 2022 (UTC)Reply
I was looking for the formula that would give the ratio of angle of incoming rays to angle of outgoing rays, and in particular I'm interested in the case where the object being imaged is at an extreme distance (e.g. astronomical). I would consider this to be "magnification", although I understand the definition of magnification given in the article. There are basically two kinds of magnification when talking about lenses, spatial and angular magnification. I believe when talking about a telescope's magnification, we would be talking about angular magnification? Tedwtoal (talk) 21:52, 4 August 2022 (UTC)Reply
I wanted to be able to calculate the size (e.g. in meters) of the image at the focal plane. I think I understand how, but it might be good to explicitly show a formula. I am particularly interested in images of objects at astronomical distances. What I THINK is the formula is: say we are talking about imaging a planet at distance D with diameter d in a telescope with focal length f where f << D; then the image size would be d times the magnification, or df/D (?). Tedwtoal (talk) 21:57, 4 August 2022 (UTC)Reply
Both are currently used in this article. 206.180.44.25 (talk) 14:15, 22 April 2024 (UTC)Reply