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Thread: Vision

  1. #1 Vision 
    Forum Sophomore Stranger's Avatar
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    When you read something for instance and then you "let your eye", you notice that another blurred image of the lines appear.

    Also, when you put your hand in front of your eye and then look at the wall, you'll see another semi transparent hand.

    Why does that happen? And in the second case, why does the "phenomenon" cease when you close one eye?

    Thanks


    Watch what thy eyes can't see... and live it.

    (T.B)
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  3. #2  
    Forum Ph.D.
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    You have 2 eyes. You get 2 different images through them.


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  4. #3  
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    Ok that explains why it stops when I close an eye, but why, when I look at my hands, they form 1 image, but when I look at the wall, there is this semi transparent hand?
    Watch what thy eyes can't see... and live it.

    (T.B)
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  5. #4  
    Forum Ph.D.
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    Maybe this is what you're looking for :P
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  6. #5  
    JS
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    When you focus on a point on the wall you align your eyeballs so that the lines of sight cross at exactly that point. The hand, being closer, appears doubled because the eyes are looking in different directions.
    And God said: Div(E) = \rho / \epsilon_0, Curl(E) = - \partial(B,t), Div(B) = 0, Curl(B) = \mu_0 (j + \epsilon_0 \partial(E,t)). And there was light.

    [...]

    And thus God sent forth Man from the Garden of Eden after a heated discussion of dresscodes and eating habits.
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