What is the meaning of Lens?

noun

• A transparent optical device used to converge or diverge transmitted light and to form images.
  • synonyms: lense, lens system
• Genus of small erect or climbing herbs with pinnate leaves and small inconspicuous white flowers and small flattened pods: lentils.
  • synonyms: genus Lens
• Metaphor) a channel through which something can be seen or understood. (
  • usage: "the writer is the lens through which history can be seen"
• Biconvex transparent body situated behind the iris in the eye; its role (along with the cornea) is to focuses light on the retina.
  • synonyms: crystalline lens, lens of the eye
• Electronic equipment that uses a magnetic or electric field in order to focus a beam of electrons.
  • synonyms: electron lens