PH-1727

Refraction

Physics · Secondary 4 · Hard · Refraction

1. $1.5 \times 10^8\,\text{m/s}$
2. $2.0 \times 10^8\,\text{m/s}$
3. $3.0 \times 10^8\,\text{m/s}$
4. $4.5 \times 10^8\,\text{m/s}$

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