[Phys-L] Re: Zeno's Paradoxes

[Hugh Haskell <hhaskell@MINDSPRING.COM>]

At 9:32 +0800 4/6/05, Julie Quah wrote:
> Hi, something came to my mind as i was thinking about the image on a
> plane mirror. Is the image laterally inverted? If one compare the
> image formed on the pin hole camera, which has a left-right
> inversion, the image on the plane mirror seems not to show the same
> effect.

They're not the same thing. The image of a pinhole camera has been
both left-right *and* top bottom inverted. Or similarly, rotated 180
degrees about an axis perpendicular to the pinhole. A mirror's
inversion is front-back. Imagine holding a transparency with writing
on it up to a mirror, held so that you can read it from where you
stand, with the transparency between you and the mirror. What you see
in the mirror is the transparency as you would see it if you turned
it over.

So the two situations are not the same thing, and therefore you
should not expect to see the same thing.

Hugh
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Hugh Haskell
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<mailto:hhaskell@mindspring.com>

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