Which of the following is a method to reduce optical aberration?

Using aspherical lens designs is a method to reduce optical aberration due to their unique shape that deviates from the simple spherical curve of traditional lenses. Traditional spherical lenses can introduce various types of aberrations, such as spherical aberration, which occurs when light rays that strike the lens at different distances from the optical axis do not converge at the same point. Aspherical lenses, on the other hand, are designed to provide a more complex surface profile, which allows them to bend light more uniformly across the lens surface. This results in improved focus across a wider area and minimizes distortions, leading to clearer images.

By effectively counteracting the common aberrations associated with spherical lenses, aspherical designs contribute significantly to enhanced optical performance. This is particularly beneficial in high-precision applications, such as cameras and optical instruments, where image quality is critical.