what do u mean bu focal length
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The distance between the centre of a mirror or a lens and its focus
एक दर्पण या लेंस के केंद्रबिंदु से उसके फ़ोकस की दूरी; नाभीय दूरी
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Answer:
The distance between the centre of lens or curved mirror and its focus ...
Hope it helps uh
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