The reticule - is a clear, protective lens covering on the eyes of snakes and lizards. It is discarded with the rest of the skin when the animal sheds.
They don't need to. The eyes are covered by a clear protective 'lens' - called the 'brille' which prevents dust etc getting to the actual eyeball.
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
Converging lens is a convex lens.
if you are using A+ it is lens
A crystalline lens is the lens in the human eye.
Double-convex lens
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.
= A lens cap is a cover to a lens on a camera or camcorder.=