What does the word lens mean?

Usage examples for lens

  1. France's men of the lens and the retort have become precursors where France's men of the boat and the sword went first, and have opened paths to even richer fields than those in which the harvesters have reaped. – The French in the Heart of America by John Finley
  2. Nevertheless I opened wide my lens, steadied the camera, and gave it a half- second. – African Camp Fires by Stewart Edward White
  3. Yes, she answered, in a tone as casual as his own, he would doubtless not lose this opportunity of examining the cracks that have appeared recently on its surface, if he can see them with that lens, which isn'tlikely. – The Mayor of Warwick by Herbert M. Hopkins