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प्रश्न
Write an Explanation.
Principal focus
परिभाषा
स्पष्ट कीजिए
उत्तर
Rays travelling parallel to the principal axis of a lens, after refraction, converge to a point on the principal axis or diverge in such a way that they appear to be coming out of a point on the principal axis. This point is called the principal focus of the lens.
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