Doing a tracing of lenses doesn't show you much but direction of the image
and compression or expansion.

You say you can read a news paper in pitch darkness with a candle 200 yards
away just as well as having it over the shoulder. We don't buy the concept
or the fact. It isn't rocket science.

Martin
Martin Eastburn
@ home at Lions' Lair with our computer lionslair at consolidated dot net
NRA LOH, NRA Life
NRA Second Amendment Task Force Charter Founder



Leo Lichtman wrote:
wrote: A lens can't collect and focus more energy
than is intercepted by it's total area. (clip)
^^^^^^^^^^^^^^^^^^
That is true. However, a given light source at a greater distance produces
a proportionately smaller image.**I DON'T See the SO** so the brightness of the image remains the
same. I'm not making this up. Lay out a diagram of a lens and do the ray
tracing, and you'll see.

Or, as experimental evidence, think about what i said about taking a
photograph. Let's say you take a picture of two billboards. One is 100
feet from you, and the other is 1000 feet. They are in the same picture,
and they are both correctly exposed. The more distant billboard has the
same illumination falling on it, but, being 10x farther away, the lens will
receive 1/100 as much light. Inside the camera, the image of the more
distant billboard will be 1/10 as large, so it will have 1/100 as much area.
So the brightness of the image will come out the SAME.



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