A magnetic lens is a device for the focusing or deflection of moving charged particles, such as electrons or ions, by use of the magnetic Lorentz force. This model requires both the Particle Tracing Module and the AC/DC Module. Any axially symmetric magnetic field produced by current-carrying coils with or without ferromagnetic materials or by permanent magnets is a magnetic lens (see Sections 4-4 and 4-7). Magnetic lenses are found in various applications. Xiaomi Modular Optical System is making headlines as the Chinese tech giant reportedly moves its futuristic magnetic modular camera lens toward mass production, potentially bringing advanced photography capabilities to smartphones as soon as 2026.