A basic overview of the history and practical applications of the microscope When the microscope was developed in the seventeenth century, it opened up a new world never seen before. Use this video to help students feel comfortable with microscopes, and to teach them about the history of the microscope. Topics covered include types of microscopes, proper handling and use, and slide preparation. Includes: teacher’s guide with blackline masters, lesson plans, projects and an answer key. 20 minutes. Grades 6-9.