(d) The light that reaches the telescopes comes from very far away celestial objects. Draw a ray diagram to show what happens when light from a far away object falls on a convex lens and a concave lens.
All light from a far away object (considered to be at infinity) converges to the focus of the lens.
- In a convex lens, it converges to the focus.
- In a concave lens, it appears to diverge from the focus.