Refraction, Light changes direction as it passes from one medium to another., Reflection, Light hits an object and bounces back changing its directions., Light, Energy that allows us to see. It travels in a straight line., Transparent, Materials that let all the light to pass through., Translucent, Materials that allow some light to pass through., Opaque, Materials that let no light to pass through., Natural, Sources of light such as the Sun, stars or lava., Artificial, Sources of light such as a lamp, a mobile or a projector.

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