Quick Answer:The Magnifier Glass 3” is a hand-held magnifier with a 75 mm (3-inch) biconvex lens, used for close inspection of biological, rock and metal samples and to show how a convex lens forms an enlarged virtual image.
Last updated: 18 October 2026
Key Features
Large 75 mm (3-inch) lens.
Biconvex (double-convex) spherical lens.
Hand-held, with a rim and handle.
Suits specimen inspection and basic optics lessons.
Technical Specifications
Specification
Value
Lens diameter
75 mm (3 in)
Lens type
Biconvex spherical
Format
Hand-held with rim and handle
How It Is Used
The magnifier is held between the eye and the specimen and moved until the enlarged, upright image is sharp. It is used for looking at leaves, insects, rocks or metal surfaces, and in optics lessons to show that an object inside the focal length of a convex lens gives a magnified virtual image.
Frequently Asked Questions
What size is the lens of the Magnifier Glass 3”?
75 mm, which is 3 inches, and it is a biconvex spherical lens.
