What is the actual speed of light in glass?

Answer 1

Light travels at 300,000 kps in air. Glass is a more dense medium than air. This means that the particles in glass are more than compared to air. Because of this, light will slow down, thus will bend towards the line of equilibrium (which is a fancy word for line of the center). This makes the light face another angle inside the glass and when it passes out of the glass. And WHY does light slow down in glass? As stated above, there are more particles in glass than in air. Imagine of you were to pass though a crowd. Wouldn't it be faster to pass through a crowd with less people instead of a crowd with a lot of people pushing you here and there?

The speed of light in glass is 65.99% of the speed of light in vacuum.

That is 65.99/100 x 3 x 108 ms-1

While it's in the glass, nothing happens to the speed.

The speed of light in most substances - such as glass - is less than the speed of light in a vacuum. Specifically, the speed of light in glass is also less than the speed of light in air. The speed of light in air is almost the same as the speed of light in a vacuum. (One rule of thumb is that the speed of light tends to be slower in more dense materials ... this isn't always true, but for "similar" materials like different kinds of silicate glasses there's a fairly strong correlation between refractive index, which is related to the speed of light in that material, and density).

Answer 2

The speed of light in glass is slower than in a vacuum, around 200,000 km/s to 300,000 km/s depending on the type of glass. This is due to the interaction of light with the atoms in the glass material, causing a decrease in speed.

Answer 3

That depends on the specific type of glass. Typically it is somewhere close to 2/3 the speed of light in a vacuum, i.e., the speed of light in glass should be approximately 200,000 km/second. To get more accurate values, look up the "index of refraction" for a specific type of glass Dividing the speed of light in a vacuum by that number will give you the speed of light in that type of glass.

You should have an idea of refractive index. It is the ration of the speed of light in vacuum to the speed of light in that material. For regular glass its 1.5. So the speed of light in glass is 3*108/1.5 which is close to 2*108 m/s.

Answer 4

The same as anywhere else, 299,792,458 m/s. Being in a glass doesn't change its speed since light is electromagnetic radiation and doesn't have mass.

Sorry, it's slower. By about 2/3 or 200,000 kilometers per second.

Answer 5

-- As the light enters the glass block, its speed either increases or decreases,

depending on what kind of substance it's coming out of.

-- While the light is inside the glass block, its speed doesn't change.

-- When the light leaves the glass block, its speed either increases or decreases,

depending on what kind of substance it's going into.

Answer 6

The exact speed of light depends on the material. Since there are different types of glass, the exact speed can vary. A typical speed of glass in optic fiber is about 2/3 the speed of light in a vacuum.

Answer 7

Space/Air 300 million meters per second

Water 227 million mps.

Glass 197 million mps.

Diomand 125 million mps.

Answer 8

It depends on the type of glass; typical speeds are about 2/3 the speed of light in a vacuum.

Answer 9

By itself, glass will not travel in water. Its speed will depend on the propulsion force and its hydrodynamic shape.

Answer 10

Yes, it does: at over 200,000,000 metres per second.