Question

what is the term for mid point of lens

Answer 1

A lens is a transparent medium (usually glass) bounded by two curved surfaces (generally either spherical, cylindrical, or plane surfaces). ... The point on the optic axis which lies midway between the two bounding surfaces is called the optic centre.

Answer 2

$\sf{optical \: centre \: is \: the \: term \: refers } \\ \sf{for \: mid \: point \: of \: lens.}$

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