Physics
Answer
Optical centre is a point on the principal axis of the lens such that a ray of light passing through this point emerges parallel to its direction of incidence. The optical centre is thus the centre of the lens.
The point O is the optical centre of the convex and concave lenses .
Related Questions
A ray of light incident at a point on the principal axis of a convex lens passes undeviated through the lens.
(a) What special name is given to this point on the principal axis?
(b) Draw a labelled diagram to support the answer in part (a).
Define the term principal foci of a convex lens and illustrate your answer with the aid of proper diagrams.
State difference between a convex and a concave lens in their —
(a) appearance, and
(b) action on the incident light.
Define the term principal axis of a lens.