When Maxwell went to calculate the speed of these electromagnetic waves, he was surprised to see the speed of light pop out – the first theoretical calculation of this important number.

The speed of light – the fastest speed in the universe – reveals mind-blowing truths about reality. Why does this limit exist ...

Even a sewing needle measuring just 35mm could cause significant damage if moving at an absurdly high speed, resulting in ...

is. Light of frequency \(4.6\times 10^{14}Hz\) travels at a speed of \(1.24\times 10^{8}ms^{-1}\) in diamond. Calculate the refractive index of diamond for this colour of light.

The change in direction of a ray depends on the change in the speed of the light and can be used to calculate the refractive index. For the example above the refractive index \(n\) of the glass is ...