Question

Define optical centre of a spherical lens.....​

Answer 1

Answer:

a) It is the central point of the lens through which a ray of light passes without suffering any deviation. (b) The object will be placed at F.

Answer 2

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The optical centre is defined as the geometric centre of the curved lens . ... Focus :The principal focus is defined as the point on the principal axis where the light rays traveling parallel to the principal axis after refraction actually meet (for a convex lens) or appear to meet (for a concave lens).