Light coming from the sun is white light and contains seven colours.

$A$ beam of white light falling on a glass prism gets split up into seven colours marked $1$ to $7$ as shown in the diagram.
$(a)$ The colours at positions marked $3$ and $5$ are similar to the colour of the sky and the colour of gold metal respectively. Is the above statement made by the student correct or incorrect? Justify.
$(b)$ Which of the above shown positions corresponds approximately to the colour of:
$(i)$ a brinjal
$(ii)$ danger signal
$(iii)$ neel (indigo) which is applied to clothes
$(iv)$ orange

Which of the following relationships regarding the wavelengths $\lambda$ of different colors of light is correct?

Which color appears at the top of a rainbow observed in the sky?

Which optical phenomenon is responsible for the formation of a rainbow?

Define dispersion of white light.