The objective lens is the single most important lens of the microscope. It receives a reversed cone of light from the specimen (see above) and forms the primary magnified image of the specimen. This primary image is a magnified inverted, real image that comes to focus at a fixed distance, about 160 mm, inside the microscope tube, i.e., near the top of the microscope tube just below the eyepiece. This image can be seen by removing the eyepiece and placing a piece of tracing paper over the end of the tube.