> <<If you wanted to be really pedantic>> > then you would realise that all your calculations apply to pinholes in an > "infinitely thin" plate. With real materials which have finite thickness > the calculations are more involved ;o) shush you! I sit here fiddling with brass foil measuring around 0.02mm thick (responsible for more than a little blood being shed around our house!) which I make available to students totally free of charge for pinholes. It's as close as I can get to a 'perfect' material as it has both structural strength and a suitable thickness. > 2) What a sad reflection on academia. A copyright notice on a graph! Where > have the days gone when Universities did work for the good of mankind ;o) hey, I'm not there anymore and they have a clause in their contract that states any work undertaken while employed at the college either for the college or not becomes the property of the college (!) I figured stuff I make available to students after I've left better be covered with a copyright notice so at least when the plagiarize it and get it wrong I'll have something to point to ;-) they've absconded with everything else, including pics I did of Anita that I incorporated into a pictorial demonstration of how lens focal lengths affect compression/expansion. cheeky really, especially since it weas done while I wasn't working there but hey, I took it in as a learning aid.. . :-? anyway, I just uploaded that one too - http://tinyurl.com/3ehgn k
