Brain Pop has always been seen as a tool for children, but now brain Pop has an educators page. Using the link below you can access a page of different lesson ideas for teaching your students about microscopes. All lessons range in appropriate grade level. They are all aligned with the CCSS but not the NGSS. Some lessons may need to modified for the grade level you are looking for but the lesson ideas are very student centered using brain pop as a tool.
Microscope Lesson Ideas