What is an achromatic lens designed to do?

An achromatic lens is specifically designed to focus multiple colors of light to the same point, effectively minimizing chromatic aberration. Chromatic aberration occurs when different wavelengths (or colors) of light do not converge at the same point after passing through a lens, leading to blurred or distorted images. An achromatic lens usually consists of two different types of glass that are shaped to counteract this effect. By combining these materials, the lens can bring two specific wavelengths, typically red and blue light, into focus at the same point, resulting in a clearer and more accurate image across a broader spectrum of colors.

This ability to limit chromatic aberration makes the achromatic lens especially valuable in photography and optical instruments, ensuring high-quality images without color distortion. The other options do not align with the primary function of an achromatic lens.