"a form of energy made of waves that move up and down", "light" "light that bounces off an object", "reflection" "to take in", "absorb" "not able to let light pass through", "opaque" "able to let some but not all light pass through", "translucent" "able to let all light pass through", "transparent" "the dark area that results when light is blocked", "shadow" "the light waves our eyes can see", "visible light"
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