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| Green Building Bible, Fourth Edition |
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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.
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.
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.
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.
Posted By: Mike1Indeed, yes. I remember checking the window when I first heard about the test. Hence my belief that the coatings are there.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.
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?
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
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