The refractive index of water being 1.33 means —

• aLight travels 1.33 times faster in water than in air
• bFor any pair of incident and refracted angles, $\frac{\sin\theta}{\sin\theta'} = 1.33$ when light goes from air to water
• cThe focal length of water is 1.33 m
• dWater absorbs 1.33% of incident light