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Definitions of lens on the Web:
recived from wordnetweb.princeton.edu/perl/webwn
It is lens. The lens consists of the lens capsule, the lens epithelium, and the lens fibres.
)( is a concave lens() is a convex lens
The ocular is the upper lens and objective is the lower lens
The objective lens
A crystalline lens is the lens in the human eye.
The pole of a lens is the midpoint of the lens' geometric axis. It is where the principal axis intersects the lens.
Double-convex lens
The best lens hood for a Canon 55-250 lens is the Canon ET-63 lens hood. It helps reduce lens flare and protects the lens from unwanted light.
The best lens hood for a Canon 18-55mm lens is the Canon EW-63C lens hood. It helps reduce lens flare and protects the lens from accidental bumps and scratches.
A converging lens is also known as a magnifying lens. The shape of the lens is a double convex shape.
It depends on the lens. Assuming parallel rays entering the lens: Convex lens - they converge, Concave lens - they dinverge.
A convex lens is also known as a converging lens, while a concave lens is also known as a diverging lens.