hand lens

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A hand-held, steel- or plastic-mounted, optical magnifying system usually consisting of two or more optical elements, which is used in the field to provide an enlarged image of rocks, minerals, and fossils, ranging from 5× to 20×. Hand lenses vary in diameter from 0.5 to 1.5 cm, can be carried conveniently in a pocket, and form an essential tool in a geologist's field kit.

Subjects: Earth Sciences and Geography.

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