Which are characteristics of a ray when it hits a boundary and refracts, but not when it hits the boundary and reflects? Choose two correct answers.

Refraction occurs when a ray passes from one material into another, so it passes through the boundary and its speed changes because light travels at different speeds in different materials. Reflection, by contrast, sends the ray back from the boundary rather than through it. Thus the characteristics unique to refraction here are “passes through the boundary” and “changes speed.”

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