Oh, dear, please be careful about "lines of resolution." The traditional meaning is not at all what someone would guess and makes a camera sound like it less resolution than it actually does. The traditional meaning is, lines of resolution "per picture height" --- which is to say, if the screen were a perfect square, as wide as it is high (which no screen is), then its horizontal resolution would be (insert number).
So, if a camera resolved a 1920 x 1080 image, you would not say it has about 2,000 lines of resolution, you would say it has about 1,000. This totally obtuse way of talking about resolution carries over from analog, NTSC days, where their measuring equipment, I'm supposing, somehow made it easier to talk about resolution in this way. It is not the way people think about resolution today, when all the time we are talking about a rectangle that is a certain number of pixels wide by a certain number of pixels high. For example, 1920 x 1080.
So, if a camera "resolves about 800 lines," then the image is about 1400 x 800.
I don't think you have that quite right...you can't make out a line unless you can see something in between, so you'll need a bit more than 800 pixels to see 800 lines.