There's a neat way to propagate light over long distancesindefinitely.
A) If you had two positive lenses with focal length 100mm placedalong the same optical axis such that they are 200mm from eachother. Find the final image of the a light source placed at 110mmfrom the first lens.
B) Now, suppose you had three lenses placed in tandem along thesame optical axis so that the space between each is 200mm. RepeatA) for a light source placed at 110mm from the first lens.
C) Draw a ray diagram for A), and B). Also, predict and explainhow this would look if you added more lenses indefinitely.