Find the focal length if v = 21 cm and u = 84 CM. Please help me, it is very urgent.
The one who will answer to my question correctly, I will mark him or her as Brainliest answer.
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Find the focal length if v = 21 cm and u = 84 CM. Please help me, it is very urgent.
The one who will answer to my question correctly, I will mark him or her as Brainliest answer.
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