It is lens. The lens consists of the lens capsule, the lens epithelium, and the lens fibres.
The ocular is the upper lens and objective is the lower lens
)( is a concave lens() is a convex lens
The objective lens
if you are using A+ it is lens
Converging lens is a convex lens.
A crystalline lens is the lens in the human eye.
This depends on the type of lens. If it is a convex lens then they converge at the focus on the other side of the lens. If it is a concave lens, then they diverge and appear to be coming from the focus present on the same side of the lens as the incident ray.
Double-convex lens
= 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.
The Shutter.