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Birefringence Patterns in a Bus Window

Train or car windows made of safety glass often reveal patterns due to birefringence. Polarized light will not pass the window pane quite equally and produce patches of different brightnesses.The material is anisotropic, which means that its physical properties depend on direction. The light travelling through the window is split into two different beams causing it to travel at different speeds. The phenomenon is already visible with the bare eye, a polarizing filter will enhance the patterns. Panasonic Lumix GH1, 14-140 mm zoom lens, polarizing filter.


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