PH-456

Refraction

Physics · Secondary 3 · Medium · Refraction

1. $2.0\times10^8\,\text{m/s}$
2. $2.1\times10^8\,\text{m/s}$
3. $3.0\times10^8\,\text{m/s}$
4. $4.2\times10^8\,\text{m/s}$

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