Quasioptics is a branch of optics that deals with the propagation of electromagnetic waves, particularly in the microwave and millimeter-wave frequency ranges, using techniques and principles that are somewhat distinct from traditional optics. While conventional optics typically focuses on visible light and involves the study of lenses, mirrors, and geometric optics, quasioptics emphasizes the wave nature of electromagnetic radiation and often utilizes structures that behave like optical components but operate at longer wavelengths.
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