Speed of light in vacuum = ' c '
-- Speed of light in Air . . 99.97% of ' c '.
-- in Water . . . . . . . . 75% of ' c '.
-- in Crown Glass . . . 64.9%
-- in Flint Glass . . . . . 61.7%
-- in Diamond . . . . . . 41.3%
The speed of light in glass is the reciprocal of the refractive index of the glass or 1/(refractive index). Not all glass is the same: its refractive index can range from less than 1.5 for Pyrex (a borosilicate glass) to more than 1.9 for (impure) flint glass. This means the speed of light in glass can range between 0.52 and 0.68 of its speed in vacuum.
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Light does not change speed when it goes through glass.
No, slower. Light travels fastest in a vacuum. Anything transparent that light can pass through slows it down somewhat. Diamond crystal slows it down notably, which is part of what causes the "fire" in a diamond.
The speed of light slows down ... in general, the denser the material, the lower the speed of light. (For example : air to water to glass.) The maximum speed is in a vacuum.
Those speeds are equal, even though the speed of the light was temporarily less while it was inside the glass.
3/4th
About 2/3 its speed in a vacuum.
Depends on the refractive index of the medium itself
It will depend on the type of glass, and something called its refractive index. All materials have a refractive index which will effect the speed of the light through it. The speed of light through a vacuum is 3.0x10^8 m/s, and a material such as glass will be lower than this.
when the light enters into another medium, its speed changes. Hence there will be the change in the wavelength. Speed = frequency times wavelength Since the speed of light is less is glass compare to the air, its wave length will be less in glass.
The speed of light in glass is the reciprocal of the refractive index of the glass or 1/(refractive index). Not all glass is the same: its refractive index can range from less than 1.5 for Pyrex (a borosilicate glass) to more than 1.9 for (impure) flint glass. This means the speed of light in glass can range between 0.52 and 0.68 of its speed in vacuum.
The speed of light is minimum in Glass. It is because light travels at minimum speed in solids.
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Light does not change speed when it goes through glass.
The refractive index of diamond is about 2.42 . So the speed of light in it is (speed of light in vacuum) divided by (2.42) That's 123.9 thousand kilometers per second (about 77,000 miles per second).