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Old 2007-09-15, 11:36   #13
davieddy
 
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"Lucan"
Dec 2006
England

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Quote:
Originally Posted by victor View Post
Haha, now I see why my answer was incorrect!

I thought the image was fitting a 10 ft square screen :)

Thank you David!

If 10ft away from the beamer the image occupies 10ft x 10ft, 15ft away the image is 15ft x 15ft big.
Glad that observation was of help.
Your result follows from similar triangles, but refocussing alters
the angles of the triangle (slightly)

David
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