You must carry out the experiments, gather data, produce tables of properties for the lenses, use the lenses to examine the microscope slides, analyze your results and give Brother Gregory the names of the cells on the microscope slides. The get Mendel's Mother to help you calculate the refractive index of the various types of glass used to make Brother Gregory's lenses. Save this information in the form of a table. You will need it later. Read about the properties of lenses , and how light is bent in a special way as it passes through curved glass surfaces .
Every lens has a set of properties.
One of these properties is the ability to bring light to a focus . You must know all about how lenses focus light and the property know as the focal length . See how the image of an object can become magnified , as light from the object passes through a lens. You will need all this information when you are putting together your own microscope. A magnified image of that object is formed on the other side of this lens.