A lens is something that transmits and refracts light. Some examples of where you can find lenses are your eyes and cameras.
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 Shutter.
= A lens cap is a cover to a lens on a camera or camcorder.=
The upper lens is called the ocular lens or the eyepiece.
It depends on the lens. Assuming parallel rays entering the lens: Convex lens - they converge, Concave lens - they dinverge.