Definition: "Focus Lens Magnifier" - A device that magnifies an object at a certain focal length, allowing users to see smaller objects clearly without distortion. Definition: A magnifying lens designed for viewing small or close-up images on a computer screen. This is often used in conjunction with a lens with a higher focal length. The term "focal length magnifier" refers specifically to the lens's ability to magnify an image by adjusting its focal length, which helps users see objects that are too far away.