What lens allows you to use multiple focal lengths?

• A. Prime Lens
• B. Zoom Lens
• C. Fish-eye Lens
• D. Macro Lens

Answer: (B)

A lens that lets you use multiple focal lengths is a zoom lens. It has movable optical elements inside that change the effective focal length as you turn the zoom ring, so you can go from wide perspective to close-up telephoto without swapping lenses or stepping back. A prime lens stays at one fixed focal length, so switching framing requires a different lens or changing distance to the subject. The fish-eye lens is a specialized ultra-wide option with strong distortion used for creative effects, not for flexible framing, and the macro lens is built for close-up work with high magnification. So the zoom lens is the best choice for multiple focal lengths.