Why do objects appear larger when closer?

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Offline latebind

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Why do objects appear larger when closer?
« on: 08/03/2009 14:00:03 »
I would like to ask what is happening on a physics level?

I do understand that the angle at which the light rays converge on your retina causes the image to look larger, but is there an underlying fundamental reason why this object should appear to be larger/smaller from a relative point.

Is it something to do with light waves? Or maybe special relativity? Or both  [:D]

Thank you
« Last Edit: 08/03/2009 14:07:09 by latebind »
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Offline swansont

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Why do objects appear larger when closer?
« Reply #1 on: 08/03/2009 14:31:16 »
Geometry.  The size of an object is proportional to the angle it subtends, and also to the distance.  So an object twice as far away but twice as tall will take up the same angle of view.  Without other information for comparison, they will appear to be the same size, e.g. the moon and the sun.