Light travels in a straight line until it strikes an object. Light can be reflected by a mirror, refracted by a lens, or absorbed by an object.
Understand and apply knowledge of sound, light, electricity, magnetism, and heat.
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Plan and conduct an investigation to determine the effect of placing objects made with different materials in the path of a beam of light.
Make observations to construct an evidence-based account that objects can be seen only when illuminated.
Use tools and materials to design and build a device that uses light or sound to solve the problem of communicating over a distance.