Lenses are used in cameras, telescopes, binoculars, microscopes and corrective glasses. A lens can be converging (convex) or diverging (concave). The centre of the lens is called the optical centre C.

There are some design variations including using a concave-shaped ... was in astronomical telescopes because the folded optical path enabled significant reductions in their physical size and weight.

Telescopes are great tools for observing the heavens, or even surrounding landscapes if you have the right vantage point. You ...

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We have rounded up the best lenses for astrophotography, exactly what you need for capturing stunning shots of May's full moon and the Eta Aquarid meteor shower. Want to take stunning shots of the ...

The most commonly used and the earliest example of an achromatic lens is the achromatic doublet. An achromatic doublet is made from a pair of glasses, of which one is typically a concave and another ...

National Astronomical Observatories, Chinese Academy of Sciences, A20 Datun Road, Chaoyang District, Beijing 100012, China Key Laboratory for Radio Astronomy, Chinese Academy of Sciences, Nanjing ...

and new tail lamps with concave lens for a cool ‘jet afterburner’ effect. While the roadster’s front grille now accommodates a radar sensor for the Mazda Radar Cruise Control (adaptive ...