the lens or system of lenses in a telescope or microscope that is nearest the object being viewed
Moving
The dioptre, which is equal to 1/meter.
Converging lens is a convex lens.
if you are using A+ it is lens
objective lens system
The eyepiece can also be referred to as the lens system or lens
Eye
the lens or system of lenses in a telescope or microscope that is nearest the object being viewed
the lens or system of lenses in a telescope or microscope that is nearest the object being viewed
convex
Moving
The focal point F and focal length f of a positive (convex) lens, a negative (concave) lens, a concave mirror, and a convex mirror. The focal length of an optical system is a measure of how strongly the system converges or diverges light.
In a camera with a removable lens system, the camera body is all of the camera except the lens mechanism. Many more-sophisticated cameras employ a system of removable/ exchangeable lenses. The "camera body" and the "lens" are often sold separately. What is called simply the "lens," though, is really a lens tube with multiple lenses and multiple adjustment mechanisms. It will have a standard connection point that mates to the lens mount on the camera body.
When purchasing a security system for your home lens selection is important for clarity purposes. You would want to be able to focus, zoom in and out and follow anything of interest. A proper lens for your security system will provide added safety and piece of mind.
A laser and a lens system are used to read information on a CD.
the focus wheel