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Okavanga — Birefringent Glass Ball
#birefringence #colours #glassball #polarisation #polymer #screen
Published: 2019-10-12 13:32:01 +0000 UTC; Views: 285; Favourites: 18; Downloads: 0
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By Golly - Bi What?Continuing disabling mobility problems have meant that I've been stuck inside with little opportunity to photograph outside. So, I've been messing around at my work station with filters to see if I can make anything useful by way of images. In particular, I dug out my polarising filters. If light passes through a polarising filter it becomes polarised, that is the transmitted light vibrates in only one plane. This so-called polarised light has properties that are not seen by the naked eye compared to ordinary light. For example, the glare of reflected light from a glass or water surface is all but eliminated. Most sun glasses (shades to our US cousins) have polarising filters in the glass and thereby help reduce glare. While messing about with a couple of these filters I remembered a fact about computer monitor screens that not a lot of people know: provided the screen is in a flat screen monitor (a TFT monitor) the light given off by the screen is polarised! If you are looking at thisRelated content
Comments: 7
Another beauty!! ( perhaps,.. the colors show more in stuff like this because it's a lot more dense; the light can't pass through as easily? Or something like that.. I would think.. since the colors only appear in some cases.. ) interesting!
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I think it is the stress in the glass that has cooled too quickly, Linda. But whatever the cause, interesting it is!
David
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Curious, is it not, M. Usually glass does not show the effect at all.
Many Thanks
David
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