a lens has two surfaces it has two surface of curvature.The line joining the centres of culvature of two surfaces is the principle axis of a lens.It passes through the middle of the lens.Radii of culvature of the two surfaces of a lens may not be equal.A point in the middle of a lens on the principle axis is the centre of the lens or optical centre of the lens.
lens
7 years ago by khinwint (18)
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