Name the seven colours of light.

When a ray of light passes through a glass prism then a spectrum is obtained on the screen Name the seven colours of spectrum in a serial order

The value of the critial angle is least for which of the following colours of light?

Does the value of polarizing angle depend on colour of light?

Is the speed of light in glass independent of the colour of light? If not, which of the two colours red and violet travels slower in a glass prism?