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# Refractive Index and Colour of Water

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@SaintlyDysprosium

## Questions and Answers

### What is the refractive index of water?

• 1.50
• 1.25
• 1.40
• 1.33 (correct)
• ### What is the speed of light in water in km/s?

• 225,000 km/s (correct)
• 299,792 km/s
• 250,000 km/s
• 200,000 km/s
• ### What happens to light when it enters water?

• It is refracted and split into its component colours (correct)
• It passes through unchanged
• It is absorbed
• It is reflected
• ### Why does water appear blue?

<p>Because it scatters blue wavelengths</p> Signup and view all the answers

### What is the effect of increasing temperature on the refractive index of water?

<p>It decreases</p> Signup and view all the answers

### What is the effect of increasing salinity on the refractive index of water?

<p>It increases</p> Signup and view all the answers

### What is the significance of refractive index in understanding the colour of water?

<p>It is a critical factor</p> Signup and view all the answers

### What is the ratio of the speed of light in a vacuum to the speed of light in a medium?

<p>Refractive index</p> Signup and view all the answers

## Study Notes

### Refractive Index and the Colour of Water

#### What is Refractive Index?

• Refractive index is a measure of how much a medium bends light
• It is defined as the ratio of the speed of light in a vacuum to the speed of light in the medium
• Refractive index is a dimensionless quantity, typically denoted by the symbol n

#### Refractive Index of Water

• The refractive index of water is approximately 1.33
• This means that light travels at a speed of approximately 225,000 km/s in water, compared to 299,792 km/s in a vacuum

#### How Refractive Index Affects the Colour of Water

• The refractive index of water affects the way it scatters and absorbs light
• When sunlight enters water, it is refracted, or bent, and split into its component colours (a process known as dispersion)
• The shorter, blue wavelengths are scattered more than the longer, red wavelengths, giving water its blue appearance
• The refractive index of water also affects the way it absorbs light, with longer wavelengths being absorbed more quickly than shorter wavelengths

#### Factors Affecting the Refractive Index of Water

• Temperature: the refractive index of water decreases with increasing temperature
• Salinity: the refractive index of water increases with increasing salinity
• Pressure: the refractive index of water increases with increasing pressure

#### Importance of Refractive Index in Understanding the Colour of Water

• The refractive index of water is a critical factor in understanding why water appears blue
• It is also important in fields such as optics, oceanography, and remote sensing, where the interaction of light with water is crucial.

### What is Refractive Index?

• Refractive index is a measure of how much a medium bends light
• It is the ratio of the speed of light in a vacuum to the speed of light in the medium
• Refractive index is a dimensionless quantity, denoted by the symbol n

### Refractive Index of Water

• The refractive index of water is approximately 1.33
• Light travels at a speed of approximately 225,000 km/s in water, compared to 299,792 km/s in a vacuum

### How Refractive Index Affects the Colour of Water

• The refractive index of water affects the way it scatters and absorbs light
• Sunlight is refracted, or bent, and split into its component colours (dispersion) when entering water
• Shorter, blue wavelengths are scattered more than longer, red wavelengths, giving water its blue appearance
• Longer wavelengths are absorbed more quickly than shorter wavelengths

### Factors Affecting the Refractive Index of Water

• Temperature: the refractive index of water decreases with increasing temperature
• Salinity: the refractive index of water increases with increasing salinity
• Pressure: the refractive index of water increases with increasing pressure

### Importance of Refractive Index

• The refractive index of water is crucial in understanding why water appears blue
• It is important in fields such as optics, oceanography, and remote sensing, where the interaction of light with water is crucial

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## Description

Learn about refractive index, its definition, and its application in determining the colour of water. Understand how it affects the speed of light in different mediums.

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