Question

There's a neat way to propagate light over long distances indefinitely.

A) If you had two positive lenses with focal length 100mm placed along the same optical axis such that they are 200mm from each other. Find the final image of the a light source placed at 110mm from the first lens.

B) Now, suppose you had three lenses placed in tandem along the same optical axis so that the space between each is 200mm. Repeat A) for a light source placed at 110mm from the first lens.

C) Draw a ray diagram for A), and B). Also, predict and explain how this would look if you added more lenses indefinitely.

Answer 1