(a) Out of the two lenses, one concave and the other convex, state which one will diverge a parallel beam of…
(a) Out of the two lenses, one concave and the other convex, state which one will diverge a parallel beam of light falling on it. Draw a ray diagram to show the principal focus of the lens.
Solution
(a) Concave lens
[ray diagram: two rays parallel to the principal axis diverging after passing through a concave lens, appearing to come from focus F]