Re: Optics
From: CWatters (colin.watters_at_pandoraBOX.be)
Date: 01/26/05
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Date: Wed, 26 Jan 2005 08:48:17 GMT
"Kevin" <kschaaps@rebootstation.dyndns.org> wrote in message
news:41f6ef54$0$85557$cd19a363@news.wanadoo.nl...
> When PersonX looks at the Moon the diameter of the moon appears: 10cm.
That's only because in your minds eye you are holding a rule at about arms
length. Google "similar triangles" for the maths. However because the
position of this "rule" isn't well defined it's better think of it as
filling a "percentage of the field of view in degrees". Look down at your
feet. the earth fills 100% of your field of view. Look up at the moon and it
fill say 5% of your field of view. A telescopic lens makes things look
bigger by effectively "converting" a narrow field of view to your eye's wide
field of view.
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