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A point on the principal axis of a lens, to which light rays parallel to the principal axis converge after passing through the lens, is

1. Centre of curvature
2. Origin
3. Focus
4. optical centre

Correct answer: Focus

Solution

A lens that brings rays parallel to its principal axis together does so at its focus. This point lies on the principal axis and is defined by the convergence of those rays after passing through the lens.

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