Question
State two differences between a convex and a concave lens in their (a) appearence, and (b) action on the incident light.
✓
Answer
Convex lens:
(a) Thick in the middle thinner at the edges.
(b)
(i) It converge the incident rays towards the principal axis.
(ii) It has a real focus.
Concave lens:
(a) Thin in the middle thicker at the edges.
(i) It diverges the incident rays away from the principal axis.
(ii) It has a virtual focus.
(a) Thick in the middle thinner at the edges.
(b)
(i) It converge the incident rays towards the principal axis.
(ii) It has a real focus.
Concave lens:
(a) Thin in the middle thicker at the edges.
(i) It diverges the incident rays away from the principal axis.
(ii) It has a virtual focus.
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