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The magnifying lens that a watchmaker uses for detail work is called a loop.
A watch repairer typically uses a jeweler's loupe, which is a small magnifying lens worn on the eye like a monocle. This allows them to closely examine small details on watch components while working on repairs.
A lens has many uses. With the right shape a lens can correct someones eye sight or with multiple lens you could even make a telescope. But for all uses of a lens it comes down to one job. The distortion of light.
stupid questions have no answers....
EF lens are a very popular thing in cameras. The most well known camera that uses such method of lens is the Cannon EF Lens Camera introduced in 1987.
Cameras and glasses.
One uses a divergent lens to correct for shortsightedness.
Convex lens or low power objective
A microscope uses an objective lens and an eyepiece lens to magnify tiny objects for closer examination. The objective lens gathers light from the specimen and forms an enlarged image, which is further magnified by the eyepiece lens for viewing.
A photographer also uses a lens protector, a stand, an interchangeable lens, and much more equipment.
A compound microscope uses both an objective lens and an eyepiece lens. The objective lens is located near the specimen and provides initial magnification, while the eyepiece lens further magnifies the image for viewing. This combination allows for detailed observation of small objects and biological specimens.
A reflecting telescope is different from a refracting telescope because a reflecting telescope uses a concave lens, a plane mirror, and a convex lens. While a refracting telescope uses two lens.