The refractive index of glass is 1.5. If the speed of light in a vacuum is 3* (10)^ 8 m/s, then what is the speed of light in glass? - Quora
Why do we say the speed of light 'in a vacuum' when the speed of light is constant? Is 'in a vacuum' irrelevant in this statement? - Quora
If the speed of light in vacuum is 3*108, find the absolute refractive index of a medium in which light travel with a speed of 1.4*108 m/s. Light - Reflection and Refraction-Science-Class-10
If the speed of light in vacuum is 3x10⁸ m/s, find the speed of light in a medium of absolute refractive index 1.5. Light - Reflection and Refraction-Science-Class-10
![The speed of light in a vacuum is 186,282 miles per second (299,792 kilometers per second), and in theory nothing can travel faster than light. - Did You Know? The speed of light in a vacuum is 186,282 miles per second (299,792 kilometers per second), and in theory nothing can travel faster than light. - Did You Know?](http://didyouknowstuff.com/uploads/images/image_1920x_5b1eeace5b828.jpg)
The speed of light in a vacuum is 186,282 miles per second (299,792 kilometers per second), and in theory nothing can travel faster than light. - Did You Know?
![Why is the speed of light in a vacuum constant? Why does light never travel faster or slower than 299 792 458 m / s? By Dilip D James M.A., A(mus) T.C.L Why is the speed of light in a vacuum constant? Why does light never travel faster or slower than 299 792 458 m / s? By Dilip D James M.A., A(mus) T.C.L](https://miro.medium.com/max/1400/1*cRm7uNsgTnrcmf8LzDJEaA.jpeg)