Wednesday, 11 July 2012

I can see a rainbow!

So its been a rather murky week here around the tree: the presence of permanent rain and fleeting sunshine, which makes it never quite warm enough to leave the tree in a t-shirt and an exploring vest. But the only highlight which I have witnessed amongst this pitiful summer are the rainbows.

The myth of finding a pot of gold at the end of the rainbow I'm afraid is not true. The reason intrepid explorers, why we never reach the "end" of a rainbow, is because every time you move, the rainbow moves with you (so 2 people never see the same rainbow (we each have our own personal one!!)). Also rainbows are in fact circles so have no beginning or end.

Rainbows are caused by the refraction of light inside a water droplet and this separates the sunlight into the spectrum of colours which we see: red, orange, yellow, green, blue, indigo and violet.

If you really want, you could make your own rainbow, with powerful light bulbs (1000 watts) and a water hose. But where's the fun in that? I'd rather wait for the weather to provide a rainbow, and who knows we could even get multiple rainbows!

Explorer fact: primary rainbows occur at 42 degrees roughly from the sun and secondary rainbows are around 50-52 degrees from the sun. Whereas tertiary rainbows arise at 40 degrees and quaternary at 45 degrees.

Boy am I spoiling you today!
Here's another Explorer fact: secondary rainbows are a mirror image of the primary rainbows.

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