resolving power

Optics. the ability of an optical device to produce separate images of close objects.
Photography. the degree to which a lens or photographic emulsion is able to define the details of an image.

1875–80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
resolving power
1.  physics Also called: resolution
 a.  the ability of a microscope, telescope, or other optical instrument to produce separate images of closely placed objects
 b.  the ability of a spectrometer to separate two adjacent peaks in a spectrum
2.  photog the ability of an emulsion to show up fine detail in an image

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

resolving power n.
The ability of a lens to distinguish small objects in close proximity.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The resolving power of such a virtual telescope grows with the size of the
  telescope array.
Trapped in two dimensions on the surface of a bulky piece of hardware, it
  insults the resolving power of your eyes.
Most photos appear to be cropped and show an area at or past the limits of the
  camera's resolving power.
My lecturer told me that it has something to do with resolving power.
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