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Thursday, July 10, 2008

Summer lightning

Look alternately left and right at the blue of the sky. You will not trust your eyes because it flashes continuously with bright lightning. What is the explanation for this appearance! If you look at the picture, it is imprinted on the retina of the eye. But red colour impressions remain longer on your retina than blue when you move your gaze.

So the impression of the red lightning is overlaid for an instant on the blue of the sky. These two colours together, however, produce an impression of bright light in your brain. Since a new impression of the lightning is formed with each movement of the eye, the process is repeated.

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