Grade 4 · Science · Lesson 20

Light reflection and refraction

Light travels in straight lines, but its direction can change when it hits a surface or passes from one material into another. The two main ways this happens are reflection and refraction.

What this lesson teaches

1Define reflection and refraction of light
2Distinguish between reflection and refraction using real-life examples
3Explain how light changes direction when it enters a denser medium

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