Explain optical centre of a lens with the help of proper diagram(s).

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Solution

It 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. It is marked by letter O in the figure. The optical centre is thus the centre of the lens
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The light ray falling to this point won't suffer any deviation and continues its path in the same direction.

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Q. Explain optical centre of a lens with the help of proper diagram(s)

What is the optical centre of a lens?

(a) With the help of a labelled diagram explain how a convex lens converges a beam of parallel light rays. Mark the principal axis, optical centre, principal focus and focal length of the convex lens on the diagram.
(b) State whether the convex lens has a real focus or a virtual focus. (c) List some things that convex lens and concave mirror have in common.

(a) With the help of a labelled diagram, explain how a concave lens diverges a beam of parallel light rays. Mark the principal axis, optical centre, principal focus and focal length of the concave lens on the diagram. (b) State whether concave lens has a real focus or a virtual focus. (c) List some things that concave lens and convex mirror have in common.

Define the term principal foci of a concave lens and show them with the help of proper diagrams.

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