# What Is The Speed Of Light In Water?

Why is the speed of light in water different from the speed of light in air? So, the reason behind it will be discussed below in detail. Therefore, stay connected with the article till the end. We all know that light travels in uniform substance, or medium, propagates in a straight line at a relatively constant speed, unless it is refracted, diffracted, or perturbed in some other manner. However, the intensity of light is inversely proportional to the square of the distance travelled. Let’s find out the speed of light in water

## What Is The Speed Of Light In Water?

The speed of light in water is 225, 000 km/s. The speed of light in a vacuum is 300,000 kilometers per second and the speed of light in glass is 200,000 kilometers per second. After seeing the speed of light in water and glass, you found that in water the speed is more than the glass. It is because water is liquid and glass is solid.Also, the speed of light in solid is less.

When light traveling through the air enters a different medium, such as glass or water, the speed and wavelength of the light are reduced, although the frequency remains unaltered.

The speed of light in water glass and diamond in km/s is 225, 000, 200,000, and 125,000.

Because of the enormous journey that light travels in outer space between galaxies and within the Milky Way, the distance between stars is measured in kilometers, but rather light-years, the distance light would travel in a year.

Let’s find the speed of light in water.

## Calculate The Speed Of Light In Water

So, the speed of light in water calculation is easy because of the already derived formula. The speed of light in water formula is given by,

Speed of light in water = Refractive Index / Speed of light in vacuum

In symbolic form,

V = c / n m/s

Here, v – is the speed of light in water in meter per second

c – is the refractive index

n – is the speed of light in vacuum

These are the speed of light in water scientific notation

The value of the speed of light in a vacuum is constant which is 3 x 108m/s and the value of the refractive index is 1.33. Let’s solve the speed of light in water equation further by keeping this values as,

Speed of light in water is = 3 x 108/ 1.33 = 2.25 x 108m/s.

So, this is the final values of the speed of light in water in m/s, the speed of light in water miles per second is 4.191 e10

Now that you know the speed of light in water m/s, let’s understand more about light and water.

Light is an electromagnetic wave that can be detected by the human eye. Electromagnetic radiation occurs over an extremely wide range of wavelengths, from, gamma rays with wavelengths less than about 1 x 10-11 meters to radio waves measured in meters. Water is an in-organic, teastless, odourless, transparent, and nearly colorless chemical substance. When light passes through the water surface refraction occurs since water has a refractive index of 1.33 and air has a refractive index of about 1. Therefore, when light travels from air to water, it slows down causing it to change direction slightly. And this change of direction is called refraction.

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## FAQ

### How Fast Is Light In Water?

226 million m/s

Speed of light in a vacuum and air = 300 million m/s or 273,400 mph. Speed of light in water = 226 million m/s or 205,600 mph. Speed of light in glass = 200 million m/s or 182,300 mph. Because light travels so fast it is difficult to measure the change in its speed in different materials.

### What Is The Speed Of Light In Water Class 10th?

The speed of light in water is 2.25 × 108 m/s.

### Is The Speed Of Light The Same In Water?

Does the speed of light change in air or water? Yes. Light is slowed down in transparent media such as air, water and glass. The ratio by which it is slowed is called the refractive index of the medium and is always greater than one.

### Is The Speed Of Light In Water Faster Than Air?

Speed of light in water is 3/4 of the speed of light in air. Sound travels three times faster in water than in air. Waves bend towards the slower region.

### Why Is Light Slow In Water?

The answer to the question above is that photons interact with molecules in the water which takes some time causing the net speed to drop.

### Is Speed Of Light Same In Air And Vacuum?

c (3×108m/s) is speed of light in vacuum. The speed of light is slightly slower in the air than in vacuum.

### How Fast Is The Speed Of Dark?

Darkness travels at the speed of light. More accurately, darkness does not exist by itself as a unique physical entity, but is simply the absence of light. Any time you block out most of the light – for instance, by cupping your hands together – you get darkness.

## Conclusion

From this article you know now that, when light enters a more dense substance with higher refractive ind, it bends more towards the normal line. Therefore, the speed of light in air is more than the speed of light in water. As the light enters the water, it is refracted.this natural phenomenon when there is lots of bioluminescence in the water, usually from an algae bloom of plankton. Light penetrating a water surface is scattered and absorbed or quenches as it passes downward. Water does not absorb ultraviolet light but it absorbs infrared light quickly. This is all about the speed of light in water

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What is the speed of light in water and glass?