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यदि काँच के एक लेन्स \((\mu=3 / 2)\) की हवा में फोकस दूरी \(f_{a}\) हो और पानी \((\mu=4 / 3)\) में \(f_{w}\) हो तो

(A) \(f_{w}=f_{a}\)

(B) \(f_{w}=2 f_{a}\)

(C) \(f_{w}=3 f_{a}\)

(D) \(f_{w}=4 f_{a}\)

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