Which of the following phenomena of light are involved in the formation of a rainbow?

In the figure,a ray of light $PQ$ is incident normally on one face $AB$ of an equilateral glass prism. What are the angles of incidence at faces $AB$ and $AC$?

Which colour has the maximum wavelength and which has the minimum wavelength? Explain on the basis of wavelength which colour bends the most and which colour bends the least.

$(a)$ What is dispersion of white light? What is the cause of such dispersion? Draw a diagram to show the dispersion of white light by a glass prism.
$(b)$ $A$ glass prism is able to produce a spectrum when white light passes through it,but a glass slab does not produce any spectrum. Explain why this is so.

State the cause of dispersion when white light enters a glass prism. Explain with a diagram.

Which colour of white light suffers $(i)$ least deviation and $(ii)$ maximum deviation when a beam of white light passes through a glass prism?