PH-1743

Refraction

Physics · Secondary 4 · Hard · Refraction

1. $1.2 \times 10^{8}\,\text{m s}^{-1}$
2. $2.0 \times 10^{8}\,\text{m s}^{-1}$
3. $3.0 \times 10^{8}\,\text{m s}^{-1}$
4. $4.8 \times 10^{8}\,\text{m s}^{-1}$

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