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...rpose of inverting the image. They may be made of one or more conventional lenses or [[achromatic doublet]]s, or a long cylindrical [[gradient-index optics|g Relay lenses operate by producing intermediate [[focal plane|planes of focus]]. For exa ...

...1 Ultra]] with periscope telephoto lens (rectangular opening below the two lenses)]] Smartphone lenses are often marketed in terms of "optical zoom"<ref>{{cite web|url=https://ww ...

...ple, the superlens can be applied to the TLM architecture. In conventional lenses, imaging is limited by the [[diffraction limit]]. With superlenses the deta ...as, short antennas, parabolic and other reflector antennas, horn antennas, periscope antennas, helical antennas, spiral antennas, surface-wave and leaky wave an ...