Overview: Our understanding of the world is based largely on what we see—both directly, and aided by optical devices that improve and extend our vision. Such tools as the microscope and telescope have helped extend knowledge in a variety of science fields, from the study of cells and stars to studies of the nature of light itself. In learning about light, students investigate its interactions with different materials and interpret its behaviour using a geometric ray model. Students then use their understanding of light to interpret a variety of light-based technologies and envisage new technologies we may use in the future.
Focusing Questions:
What do we know about the nature of light? What technologies have been developed that use light, and what principles of light do they show?
Key Concepts
− microscopes and telescopes
− contribution of technologies to scientific development
− transmission and absorption of light
− sources of light
− reflection and refraction − images
− vision and lenses
− imaging technologies