PH-1722

Refraction

Physics · Secondary 4 · Hard · Refraction

1. $2.0\times10^8\,\text{m s}^{-1}$
2. $4.5\times10^8\,\text{m s}^{-1}$
3. $1.5\times10^8\,\text{m s}^{-1}$
4. $3.0\times10^8\,\text{m s}^{-1}$

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