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प्रश्न
Define the term principal foci of a convex lens and illustrate your answer with the aid of proper diagrams.
थोडक्यात उत्तर
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उत्तर
A lens has two major foci, one on each side, that are positioned at equal distances from the lens along its principal axis. This is because light can enter a lens from any direction. These are recognized at focus F1 and focus F2.
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