A microscope attachment is a LENS, which is a four-letter word. A LENS is an optical device that is used to focus or disperse light rays. It is typically made of glass or plastic and can be used in a variety of applications, such as cameras, microscopes, telescopes, and eyeglasses. Lenses are used to magnify objects, allowing us to see them more clearly. They can also be used to bend light in order to create images.