Traditional lenses have a fixed focal length, but adaptive lenses can alter their shape, refractive index, or position using various mechanisms. Some of the common mechanisms include:
Electrically tunable lenses: These use electric fields to modify the shape or refractive index of the lens material. Liquid crystal lenses: These lenses use liquid crystals that reorient in response to electric fields, changing the lens's optical properties. Electrowetting lenses: These use electric fields to change the shape of a liquid droplet, which in turn modifies the lens's focal length.
