OKSci Framework [licensed for non-commercial use only] / First Grade Light. 1-PS4-2 Students who demonstrate understanding can: Make observations to construct an evidence-based account that objects can be seen only when illuminated. 1-PS4-3 Students who demonstrate understanding can: Plan and conduct an investigation to determine the effect of placing objects made with different materials in the path of a beam of light.
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Light is necessary for objects to be seen. Light can come from external or internal sources. Different materials respond to light in different ways. Some allow light to pass through, others only allow some light through, and others block light completely, creating shadows where light cannot reach.
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