If the refractive index of water is 1.33, the velocity of light in water is approximately —

• a$3 \times 10^8$ ms⁻¹
• b$2.66 \times 10^8$ ms⁻¹
• c$2 \times 10^8$ ms⁻¹
• d$1.24 \times 10^8$ ms⁻¹