magnifying glass

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magnifying glass:

see microscopemicroscope,
optical instrument used to increase the apparent size of an object. Simple Microscopes

A magnifying glass, an ordinary double convex lens having a short focal length, is a simple microscope. The reading lens and hand lens are instruments of this type.
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magnifying glass

[′mag·nə‚fī·iŋ ‚glas]
(optics)
Any device that uses a simple lens which enlarges the object being viewed.

magnifying glass

traditional detective equipment; from its use by Sherlock Holmes. [Br. Lit.: Payton, 473]

magnifying glass

, magnifier
a convex lens used to produce an enlarged image of an object