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Spher′i-cal lens.

A lens of a spherical shape, Perhaps the earliest form of lens, in the similitude of the drop of dew on a villous leaf, which so beautifully magnifies the filaments.

The spherical lenses have usually an equatorial groove in a plane perpendicular to the axis of the lens. This is closed by an opaque object, leaving a central stem. The object is to exclude light and lateral rays. See periscopic lens; Coddington lens.

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