Light from two rays is of different colours. Which row is correct?
- Aspeed of the two colours in a vacuum: different; wavelengths of the two colours in a vacuum: different
- Bspeed of the two colours in a vacuum: different; wavelengths of the two colours in a vacuum: the same
- Cspeed of the two colours in a vacuum: the same; wavelengths of the two colours in a vacuum: different
- Dspeed of the two colours in a vacuum: the same; wavelengths of the two colours in a vacuum: the same