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If a lens has a shorter focal lengthclosefocal lengthThe distance between the centre of the lens and the focal point. it is said to be more powerful. The power of a lens is defined as the reciprocalclosereciprocalThe reciprocal of a number is 1 divided by that number. The reciprocal of a fraction is that fraction turned upside down, eg the reciprocal of 3/4 is 4/3. of the focal length. Lens power is measured in dioptres (D).

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M Meem · 2021 · 1 — The f-number (f#) and numerical aperture (NA) of a conventional lens are inherently coupled. We demonstrate a free-form broadband flat lens that de-couples the ...

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Converging (convexcloseconvexAn object or shape that curves or bulges outwards, like a circle or sphere.) lenses have positive focal lengths, so they also have positive power values.

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Lenses are precisely shaped pieces of glass that have been developed and used in corrective glasses, telescopes, microscopes, binoculars, and magnifying glasses.

Diverging (concavecloseconcaveCurving inwards, rather than bulging outwards.) lenses have negative focal lengths, so they also have negative power values.