- a lens or mirror that produces a virtual image of an object smaller than the object itself.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for reducing glass
The reducing-glass will help you to get the size and position of things.The Painter in Oil
Daniel Burleigh Parkhurst
- a lens or curved mirror that produces an image smaller than the object observed