Why does secondary rainbow have inverted colour pattern?

Why we see a rainbow just after rains?

Why does dry HCI gas not change the colour on the dry litmus paper?

What is rainbow?Differntiate between a rimary rainbow and secondary rainbow with a diagram.Why two obserers do not see the same rainbow?

Why is a rainbow formed in teh sky?

Between the primary and secondary rainbows, there is a dark band known as Alexandar's dark band. This is because