Question

what is optical centre? ​

Answer 1

Answer:

It is like a pole for lens.

It is the point, through if you pass a ray of light then it will pass the lens without any bend in the path of that light ray.

Hope it helped.

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Answer 2

a point on the axis of a lens that is so located that any ray of light passing through it in passing through the lens suffers no net deviation and that may be within, without, or on either surface of the lens.