Quote:
Originally Posted by victor
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.
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Glad that observation was of help.
Your result follows from similar triangles, but refocussing alters
the angles of the triangle (slightly)
David