The speed of light in a vacuum is 3.0 × 108 m/s. Given that the refractive index of water is approximately 1.33, which value is closest to the speed of light in water?
2.3×104 m/s2.3 \times 10^4\text{ m/s}2.3×104 m/s
2.3×106 m/s2.3 \times 10^6\text{ m/s}2.3×106 m/s
2.3×108 m/s2.3 \times 10^8\text{ m/s}2.3×108 m/s
4.0×108 m/s4.0 \times 10^8\text{ m/s}4.0×108 m/s
100 exam-style questions on CIE IGCSE Physics 3.2.2 Refraction of light. Each one has a worked solution and a mark scheme showing where the marks go.