Green Building Forum - triple glazed reflections? Tue, 19 May 2026 16:46:05 +0100 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 triple glazed reflections? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18080&Focus=305163#Comment_305163 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18080&Focus=305163#Comment_305163 Sat, 03 Feb 2024 10:39:45 +0000 djh triple glazed reflections? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18080&Focus=305166#Comment_305166 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18080&Focus=305166#Comment_305166 Sat, 03 Feb 2024 11:44:17 +0000 fostertom triple glazed reflections? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18080&Focus=305168#Comment_305168 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18080&Focus=305168#Comment_305168 Sat, 03 Feb 2024 13:55:55 +0000 tony triple glazed reflections? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18080&Focus=305169#Comment_305169 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18080&Focus=305169#Comment_305169 Sat, 03 Feb 2024 16:43:27 +0000 djh triple glazed reflections? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18080&Focus=305172#Comment_305172 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18080&Focus=305172#Comment_305172 Sat, 03 Feb 2024 23:34:35 +0000 fostertom triple glazed reflections? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18080&Focus=305177#Comment_305177 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18080&Focus=305177#Comment_305177 Sun, 04 Feb 2024 12:02:21 +0000 djh Posted By: fostertomWould the ultra-thin coatings have a refraction index, or would any different indexes be only in different glass compositions?I'm not sure, but I believe the thickness of the refractive layer is important, so I don't think the refractive index of the coatings is important, since they're thin. But something must explain what I see and I don't understand it yet, so I'll keep an open mind.]]> triple glazed reflections? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18080&Focus=305185#Comment_305185 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18080&Focus=305185#Comment_305185 Sun, 04 Feb 2024 18:51:16 +0000 fostertom Posted By: djhI believe the thickness of the refractive layer is importantDon't think so - regardless of thickness a refractive layer alters the incident vs exit direction. That would have the effect of displacing the image in your vision laterally, differently for ea exit surface, dependent on the RIs of ea of glass 1, glasses 1+2 and glasses 1+2+3. If those totals don't have same increment between them, then the images won't be spaced equally.]]> triple glazed reflections? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18080&Focus=305187#Comment_305187 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18080&Focus=305187#Comment_305187 Sun, 04 Feb 2024 20:19:18 +0000 djh
https://study.com/skill/learn/how-to-use-snells-law-to-find-the-displacement-of-an-image-viewed-through-a-material-more-optically-dense-than-air-explanation.html

You can see that the the displacement is directly proportional to the thickness. So zero thickness = zero displacement.]]> triple glazed reflections? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18080&Focus=305188#Comment_305188 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18080&Focus=305188#Comment_305188 Sun, 04 Feb 2024 20:35:25 +0000 Mike1 Posted By: djhI also believe they have two soft coatings but I can't find any documentation at the minute.I can't help with your basic question, however if you shine a LED light through the glass (for example the light on a mobile phone) and look at the reflections, then any coatings should show up as a tinted colour, rather than white.]]> triple glazed reflections? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18080&Focus=305190#Comment_305190 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18080&Focus=305190#Comment_305190 Sun, 04 Feb 2024 21:14:36 +0000 tony triple glazed reflections? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18080&Focus=305192#Comment_305192 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18080&Focus=305192#Comment_305192 Sun, 04 Feb 2024 22:13:44 +0000 fostertom Posted By: djhthe displacement is directly proportional to the thickness. So zero thickness = zero displacementIt's not the displacement - it's the change of angle. An incident ray that's say parallel exits divergent, by a different amount depending on RI.]]> triple glazed reflections? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18080&Focus=305197#Comment_305197 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18080&Focus=305197#Comment_305197 Mon, 05 Feb 2024 09:24:02 +0000 fostertom triple glazed reflections? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18080&Focus=305198#Comment_305198 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18080&Focus=305198#Comment_305198 Mon, 05 Feb 2024 11:53:31 +0000 djh Posted By: Mike1
Posted By: djhI also believe they have two soft coatings but I can't find any documentation at the minute.
I can't help with your basic question, however if you shine a LED light through the glass (for example the light on a mobile phone) and look at the reflections, then any coatings should show up as a tinted colour, rather than white.Indeed, yes. I remember checking the window when I first heard about the test. Hence my belief that the coatings are there.]]> triple glazed reflections? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18080&Focus=305199#Comment_305199 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18080&Focus=305199#Comment_305199 Mon, 05 Feb 2024 12:00:49 +0000 djh Posted By: tonyRegarding three reflections, when the reflection goes through a single sheet of glass we get two paths, on going through the second sheet we can expect four , BUT two of then will be coincident explaining why there are three, q.e.d.I'm confused. There are thee sheets of glass in a triple glazed window. So I'd expect six reflections. I'm also not clear why two or more of the reflections would be coincident - maybe a diagram (or a link to one) would help?]]> triple glazed reflections? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18080&Focus=305200#Comment_305200 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18080&Focus=305200#Comment_305200 Mon, 05 Feb 2024 12:01:33 +0000 djh Posted By: fostertomOh no - I realise I'm picturing media of tapered thickness, like a lens. Parallel can't change incident vs exit angle, so RI it isn't.That's OK. I think we're both on the same page now :bigsmile:]]> triple glazed reflections? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18080&Focus=305201#Comment_305201 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18080&Focus=305201#Comment_305201 Mon, 05 Feb 2024 12:38:31 +0000 owlman