Haidinger fringes are a phenomenon observed in the field of optics, particularly in the study of light polarization. They are a type of interference pattern that appears when polarized light is viewed through an optical device, such as a polarizing filter or a birefringent crystal. When unpolarized light passes through a polarizer, it becomes polarized, and if it then passes through a second polarizer at an angle to the first, variations in intensity can occur.
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