Why do metal screens or chain link fences magnify.?

Question

When I look through a metal screen on a box screened on four sides the opposite wall appears magnified greatly. This also happens through one chain link fence with another beyond (the second fence is magnified).

Answer 1

Its an illusion there is no magnification. What happens is the eye can not fully focus on two different distance objects at the same time.
The two objects in this case being the screen/wall. If you were to look just at the screen it would be in focus and the wall not. Now if you look past the screen (thru the holes in it) you now have the wall in focus and not the screen. This will make the wall jump right out at you and "appear" to be magnified. PLEASE note this is not a "moire pattern" effect, a moire pattern causes a repetitive wavy pattern or rippled effect. Not a faux magnification effect. ~A~

Answer 2

The visual effect that you are seeing is called a "moire pattern". It is not actually a magnification of one of the screens, although it usually looks very much like a magnification.

Here are some references for further information:
http://mathworld.wolfram.com/MoirePattern.html
http://en.wikipedia.org/wiki/Moire_pattern
http://www.exploratorium.edu/snacks/moire_patterns.html

Answer 3

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