1. Define focal length and optical centre of lens.
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This point is also called a focal point. A Convex Lens can produce either a real or virtual image. Optical Centre : The optical centre is defined as the geometric centre of the curved lens . Principal Axis :The principal axis of a curved lens is defined as the imaginary line passing through its centre and focus..
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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.
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