hand glass vs lens

hand glass

noun
  • A small mirror with a handle. 

  • A small glazed frame for the protection of plants. 

lens

noun
  • An object, usually made of glass, that focuses or defocuses the light that passes through it. 

  • A genus of the legume family; its bean. 

  • The transparent crystalline structure in the eye. 

  • A construct used in statically-typed functional programming languages to access nested data structures. 

  • A convex shape bounded by two circular arcs, joined at their endpoints, the corresponding concave shape being a lune. 

  • A device which focuses or defocuses electron beams. 

  • A way of looking, literally or figuratively, at something. 

  • A body of rock, ice, or water shaped like a convex lens. 

verb
  • To film, shoot. 

  • To become thinner towards the edges. 

How often have the words hand glass and lens occurred in a corpus of books? (source: Google Ngram Viewer )