A magnifying glass (called a hand lens in laboratory contexts) is a convex lens that is used to produce a magnified image of an object. The lens is usually mounted in a frame with a handle (see image).
A sheet magnifier consists of many very narrow concentric ring-shaped lenses, such that the combination acts as a single lens but is much thinner. This arrangement is known as a Fresnel lens.
近义、反义、联想词
近义词
n.
light microscope
英英词典
magnifying glass n.
light microscope consisting of a single convex lens that is used to produce an enlarged image