Eyepiece lens magnifies the image of the specimen. This part is also known as ocular. Most school microscopes have an eyepiece with 10X magnification. Nosepiece holds the objective lenses and is sometimes called a revolving turret. You choose the objective lens by rotating to the specific lens one you want to use.
Most compound microscopes come with three or four objective lenses that revolve on the nosepiece. The most common objective lenses have power of 4X, 10X and 40X. Combined with the magnification of the eyepiece the resulting magnification is 40X, X and X magnification.
