What's tertiary rainbow? Is it possible to see teritary rainbow?

Answer 1

If a third rainbow is seen, it is called tertiary rainbow.It can be seen very rarely as it will be very dim.Double rainbows are produced when the sunlight is reflected twice in a rain drop.Similarly a third rainbow is produced if the sunlight is reflected three times within a rain drop.As the number of reflections increase,the intensity of the colours of the rainbow become less and less and that is why the third rainbow is very dim .

Answer 2

Tertiary means three. A triple rainbow. I've seen double rainbows - no reason to believe there couldn't be three.