The term 'microscope parts' can refer to a variety of components that make up a microscope. Two of the most important parts are LENSES and LENS. LENSES, which have six letters, are pieces of curved glass or plastic that are used to focus light and magnify an image. LENS, which has four letters, is a single piece of curved glass or plastic that is used to focus light and magnify an image. Both LENSES and LENS are essential components of a microscope and are necessary for it to function properly.