Image: Concave lens
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Description: Concave lens Taken by en:fir0002
Title: Concave lens
Author: User Fir0002 on en.wikipedia
Permission: Released under the GNU Free Documentation License.
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC-BY-SA-3.0
License Link: http://creativecommons.org/licenses/by-sa/3.0/
Attribution Required?: Yes
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