Question

Give the definition of optical centre of lens

Answer 1

Explanation:

The central point of the lens is known as the optical centre. Principal Axis. It is a line passing through the optical centre of the lens and perpendicular to both the faces of the lens.

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).

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Answer 2

Answer:

: 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.