loop
The focal length of the lens in the loupe
Diverging lens
A concave lens is otherwise known as a diverging lens.
A converging lens is also known as a convex lens.
There is no other name for the objective lens. However, the eyepiece is also called the ocular lens.
Another name is eyepiece or eyepiece lens.
lens
A convex lens is also known as a converging lens, while a concave lens is also known as a diverging lens.
Bifocals.
Another name for a camera lens is an "optical lens." It is designed to focus light onto the camera's sensor or film, enabling the capture of images. Depending on its specific function, it may also be referred to as a "glass" or "objective lens."
The low power objective lens on a microscope is also known as the scanning lens.
Concave and convex can refer the types of lenses used to treat refractive errors in the eyes. Concave is another word for myopic lens and convex is another name for a hyperopic lens also known as nearsighted and farsighted respectively