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Light rays disperse through a plano-concave lens.


 (plā′nō-kŏn-kāv′, -kŏn′kāv′)
Flat on one side and concave on the other: a plano-concave lens.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(of a lens) having one side concave and the other side plane
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌpleɪ noʊ kɒnˈkeɪv, -ˈkɒn keɪv)

pertaining to or noting a lens that is plane on one side and concave on the other.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
In addition, through manipulation of permittivity ([epsilon]) and permeability ([mu]), a plano-concave lens with good (ideally perfect) matching to free space can be obtained [33, 34].
Manufactured with dimensional tolerances ranging from [+ or -] 0.001" to [+ or -] 0.005", depending upon configuration, Laser Research ZnSe and ZnS Optics can be supplied as plano-convex, plano-concave, and as wedged-windows in round, rectangle, and square shapes that can include steps, holes, and other special design features.
Experimenting with different lens types and spacings in Zemax, he ultimately settled on pairing a plano-concave lens with a double-convex element.
RMI's laser beam expanders are made with high precision plano-concave and plano-convex lenses - available in a wide range of materials.
d A plano-concave lens bonded to a plano-convex lens
Manufactured to specification, configurations can include balls, ultraflat windows and wave-plates, plano-concave and -convex lenses, wedges, wedged windows, squares, and nearly hemispherical domes.
[CO.sub.2] Laser Optics feature zinc selenide positive focusing lenses in plano-convex, plano-concave, and meniscus configurations in 0.5" to 2" dia sizes and focal lengths from 1" to 20", depending on configuration, and mirrors fabricated from silicon, molybdenum, and copper in sizes from 1" to 3" dia and a variety of styles.
The lens closest to the primary is plano-concave (negative), the other is plano-convex (positive).
I solved this problem by assembling the corrector lens from two elements, one plano-convex, and the other plano-concave. ZEMAX showed me that by merely decentering the pair a small amount, I could introduce the required amount of wedge.