虹ができる理由は？光が水のつぶの中で3回動きます

How Is a Rainbow Made?

After the rain, a rainbow sometimes appears in the sky.

Have you ever wondered how it is made?

You need two things: sunlight and water drops in the air.

The sun must be behind you, and it must be low in the sky.

Sunlight looks white, but it is a mix of many colors.

When sunlight enters a water drop, the light bends.

Then it bounces off the back of the drop.

Then it bends again as it comes out.

Each color bends by a different amount.

Red light bends less than blue light.

So the colors separate, and we can see them one by one.

In the main rainbow, red is on the outside and violet is on the inside.

The rainbow appears about 42 degrees from the point directly opposite the sun.

Drops at that angle make a cone, and you are at its tip.

That is why you see a curve.

A rainbow is not an object in one place.

Each person sees a different rainbow.

Even your two eyes do not see exactly the same one.

Sometimes you can see a double rainbow.

The second arc is about 10 degrees outside the first.

Its colors are in reverse order, with red on the lower side.

From a high place, such as an airplane, you can see a full circle.

Next time the sun comes out after rain, turn your back to the sun and look!