I created and used this with my 3rd grade students. The PowerPoint goes through all of the main vocabulary words we used in our unit along with definitions, photographs and examples.
The PowerPoint includes the following words and definitions:
Investigative question, light, model, emit, light source, illumination, light beam, bounce, mirror-like reflection, reflect, scatter, iris, pupil, vision, periscope, absorb, opaque, translucent, and transparent. (There is a slide of each word along with several picture examples!)
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