Created and maintained by the American Federation of Teachers, Share My Lesson is a community of teachers, paraprofessionals and school-related personnel, specialized instructional support personnel, higher education faculty, and parents and caregivers who contribute content, collaborate, and stay up to date on the issues that matter to students and educators everywhere.
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A comprehensive lesson plan about reflection and refraction that goes into a lot of detail. Very useful. It takes the effort out of preparation.