That's both an interesting and an answerable question! 

Certain materials affect the speed of light due to the way that light interacts with the atoms and molecules in the material. When light enters a material, it interacts with the electrons in the atoms and molecules, which can cause the light to slow down or change direction. 

One factor that can affect the speed of light in a material is the density of the material. Light tend to travel more slowly through denser materials, such as glass or water, than it does through less dense materials, such as air.

Another factor which can affect the speed of light is the refractive index of the material. The refractive index is a measure of how much the material can bend light as it passes through. Materials with a higher refractive index, such as diamond, can slow down light more than materials with a lower refractive index, such as air.

In addition to these factors, the composition of the material and the wavelength of the light can also play a role in affecting the speed of light. For example, some materials may absorb certain wavelengths of light more than others, which can cause the light to slow down or be scattered.

Overall, the speed of light is affected by a complex interplay of factors that depend on the properties of the material and the characteristics of the light itself.

Thankyou for asking, please let know if you have any more doubt, take care of yourself :)
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