diopter (Crossword)

If the answer you seek is not in the answers above these definitions may help solving your crossword puzzle.

• A unit of measure of the refractive power of a lens
• In optics, unit of magnifying power of a lens or lens system
• (D) (di-AHP-tur) Unit to designate the refractive power of a lens
• (Digital cameras and photo printers) Unit for measuring a lens` refractive power
• An optical unit representing the reciprocal of the focal length (in metres) of a lens
• The unit of refracting power of lenses, denoting the reciprocal of the focal length expressed in meters
• The diopter is part of the viewfinding system of a camera that can be adjusted to compensate for your own particular eyesight
• Dioptre a unit of measurement of the refractive power of a lens which is equal to the reciprocal of the focal length measured in meters
• Close-up lenses (which screw into the front of an existing lens and act like a reading glass) are often marked in 'diopters' (2
• An instrument, invented by Hipparchus, to measure the apparent diameter of the sun or moon or to estimate the size or elevation of distant objects