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With your back to the Sun, you will see the full arc of a rainbow.

An imaginary line from the Sun , through you, will take you to the centre of the rainbow.

From that line to the centre of the rainbow, to the coloured arc is an angle of 42 degrees.

The primary rainbow's colours, from the outside are rea, orange, yellow, green, blue violet, indigo to the inside of the rainbow. Since red light has a longer wavelength than blue light, then the red arc is longer , on the outside of the r'bow. Conversely the blue light is a shorter wavelength so it is seen on the inside/shorter side of the bow. If the light is very strong/bright, then you ,may see a secondary rainbow out side the primary rainbow. The colours are reversed in the secondary rainbow. Very rarely you may see tertiary rainbow, outside the secondary rainbow and the colours are reversed again.

Also because of natural bending of light the outside of the red edge is dark and the inside of the blue edge is light.

You only see a rainbow if rain is falling and the sun is shining in different part of the sky.

The old weather lore in England, A rainbow in the morning foretells bad weather, the day.

A rainbow in the evening and the bad weather is going away for the rest of the day. In fact it is more reliable than Red Sun morning or evening.

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lenpollock

Lvl 16
1y ago

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