The focus lies along which line?

Started Mar 24, 2013 | Discussions thread
nelsonal Senior Member • Posts: 2,464
Re: The focus lies along which line?

Let's ask the same about the earth.  It's the red line, but the radius is usually relatively large as that's one of several things optical designers aim to make as close to the blue line as possible (when the radius of a circle is large enough it's approximately flat, think of how rare it is that you "see" the curvature of the earth).

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