A manifying glass works by creating a magnified virtual image of an object behind the lens.The distance between the lens and the object must be shorter than the focal length of the lens for this to occur.Otherwise,the image will appear smaller and inverted, and can be used to project images onto surfaces.
The framed lens may be mounted on a stand, keeping the lens at the right distance from the table, and therefore at the right distance from the object on the table. The latter applies if the object is small, and also if the height is adjustable. Some magnifying glass are foldable (from the handle or stand)
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