Review the different types of lenses. their nomenclature and how they affect light. Use printed diagrams of a magnifying lens and a microscope. Name the important parts Show from a sketched diagram the optics of the magnifying lens. Indicate the object position and the image position. Define as an enlarged, virtual image. Use a diagram of the lens optics for a microscope. Show how 2 images are formed and their positions. Discuss early microscopes and their optics.