A ray of white light is passed through a glass prism and spectrum is obtained on a screen.
(a) Name the seven colours of the spectrum in order.
(b) Do the colours have the same width in the spectrum ?
(c) Which of the colour of the spectrum of white light deviates (i) the most, (ii) the least ?
In the spectrum of white light, how many colours have a wavelength less than that of yellow colour?