a zoom lens is a lens with an extremely long focal length. here option (b) is correct.
When a lens is focused to infinity, its focal length can be calculated. The angle of view, or how much of the scene will be caught, and the magnification, or how big the individual elements will be, are both determined by the lens focal length. The angle of view is narrower and the magnification is higher the longer the focal length. However, a zoom lens simply adjusts the lens elements within to change focal lengths, making the subject larger or smaller within the frame. An individual can manually adjust a zoom lens to produce sharp photographs at a variety of distances from their photography subject, from up close to very far away. A camera lens that can change its focal length is known as a variable focus lens (also known as a zoom lens).
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