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Can a bag of water keep Housefly away?

By Bamboo In The Wind

I have seen it, and it does work. Why? Here's one theory... there may be others... 

An important point is it works like magic! What a boon in recurring monsoon problem?
Refraction takes place when a clear or opaque object, such as a piece of glass or a bag of water, alters the course and velocity of light. The rays of light, which normally travel in a straight line, bend. This effect is responsible for a number of optical illusions.
In theory, refraction can be just as confusing for some species of insect, especially the housefly. It boasts a highly sensitive array of eyes which allow it to see in multiple directions at once. insect pictures
The insect's head mostly consists of a pair of large complex eyes, each of which is composed of 3,000 to 6,000 simple eyes. These eyes can't move or focus on objects like human eyes, but they provide the fly with a mosaic view of the world around them. Each simple eye provides one small piece of the puzzle, much like the way a screen's pixel delivers one detail of the larger picture.
A housefly bases its sense of direction from where sunlight comes from. Some entomologists believe that when these complex, sensitive eyes experience refracted light, the insect becomes confused and flies away.


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