Question

define principles focus​

Answer 1

focal point. n. 1 (Also called) principal focus, focus the point on the axis of a lens or mirror to which parallel rays of light converge or from which they appear to diverge after refraction or reflection.

Answer 2

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• Principles focus​ :

→ It is a point where light rays coming parallel to the principle axis actually converge or appear to converge.

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