00:01
Okay, we have two lenses, each with a focal length of 6 .8 centimeters, put it on the ends of a tube that's 18 .8 centimeters in length.
00:09
We're given an object out to the left here at 20 .4 centimeters from the left -hand lens.
00:17
We want to figure out where the final image is.
00:24
So to get the image of the first lens, we use our usual lens formula and solve that for q1.
00:39
We substitute that into the, use the calculator, figure out q1, we get 10 .2 centimeters.
00:48
So that means our first image is here inside the tube at a distance of 10 .2 from the first lens, which means that remaining distance is 18 .8 minus 10 .2, which is 8 .6.
01:08
So that means that p2 is 8 .6 centimeter...