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| Shared Idea |
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| Rainbows
| Trump’s Executive Effects
| In various ways, we all know about rainbows. Perhaps you have heard tales about leprechauns having a pot of gold at the end of the rainbow. In a religious setting, there is God's covenant with Noah, where the rainbow is the sign that the world will never again be flooded in response to God's anger with humanity. Or you may be familiar with "Over the Rainbow," the song sung by Judy Garland in the 1939 movie "The Wizard of Oz," the first Technicolor movie.
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| However, the image of the rainbow is a misconception. You cannot find a pot of gold at the end of the rainbow. If you try to approach a rainbow, it moves away. There actually is no rainbow in the sky, no matter how many times you believe that you have seen one after the rain stops. To create a rainbow, sunlight must first be refracted, separating the colors of light according to the varying wavelengths. This can happen when the light passes through a droplet of water in the shy. However, it is then necessary that the refracted light passes through a lens.
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| This occurs when the sun is behind you. The refracted light passes through the lens in the human eye. This means that the rainbow actually exists within the eye. The brain imposes this image with whatever else is seen by the eye, creating a perception of a rainbow in the sky. That is why the rainbow seems to move away when you try to move towards it.
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| A diffraction grating similarly refracts light. When looking through the grating at a source of continuous light, you can perceive two 'rainbows' if the grating is properly oriented. One appears to be to the left and the other is to the right. Someone positioned next to you cannot see the rainbows, as they are actually within your eye.
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| If such is the case, why is it possible to photograph a rainbow? Well, the camera similarly has a lens. This means that the refracted light creates a rainbow within the camera, which appears on the camera's film. The rainbow that is within your eye is similarly formed within the camera!
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