Which travels more slowly in glass, red light or violet light?

In summary, the speed of light in glass is not the same for all wavelengths due to the frequency - wavelength dependency of the index of refraction. This dispersive effect is why there is a spectrum from a prism.
  • #1
zachcumer
106
0
Which travels more slowly in glass, red light or violet light?

Violet...right?

Thanks
 
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  • #2
zachcumer said:
Which travels more slowly in glass, red light or violet light?

Violet...right?

Thanks

Why? What is your argument?
You need to know how the index of refraction depends on the wavelength, a dispersive effect.
 
  • #3
what? all the question asks for is a color...
 
  • #4
they both travel at the speed of light, it's the same
 
  • #5
themtpeake said:
they both travel at the speed of light, it's the same

The speed of light in the glass is not the same for all wavelengths. The index of refraction is frequency - wavelength dependent, otherwise there would br no spectrum from a prism.
 

1. What is the reason for red light and violet light traveling at different speeds in glass?

The speed of light is dependent on the wavelength of the light. Red light has a longer wavelength compared to violet light, which is why it travels slower in glass.

2. Can the speed of light in glass be affected by other factors?

Yes, the speed of light in glass can be affected by the composition of the glass, temperature, and pressure. These factors can alter the density of the glass, which in turn affects the speed of light.

3. Is red light always slower than violet light in glass?

Not necessarily. The speed of light in a medium depends on the wavelength of the light and the properties of the medium. In some cases, red light can travel faster than violet light in glass.

4. How does the speed of light in glass compare to its speed in a vacuum?

The speed of light in a vacuum is approximately 299,792,458 meters per second. In glass, the speed of light is slower, usually around 200,000,000 meters per second.

5. Can the speed of light in glass be increased?

Yes, the speed of light in glass can be increased by using special materials, such as optical fibers, which can guide and increase the speed of light. Additionally, using certain coatings on the glass can also increase the speed of light.

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