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Using three flashlights and sheets of red, blue and green cellophane, students demonstrate that white light is composed of colored light of different wavelengths. The resource is part of the teacher's guide accompanying the video, NASA Why Files: The Case of the Mysterious Red Light. Lesson objectives are supported by the video. Additional resources, teaching tips and an answer sheet are included in the teacher's guide.
This resource is located on page 44 of the PDF document.