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Dear student,
Use the formula:
1/u+1/v=1/f
Now differentiate and get the result...
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Please feel free to ask your queries here. We are all IITians and here to help you in your IIT JEE preparation.
All the best.
Win exciting gifts by answering the questions on Discussion Forum. So help discuss any query on askiitians forum and become an Elite Expert League askiitian.
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Askiitians Expert
Sagar Singh
B.Tech, IIT Delhi
dear praveen , ur question is not clear ,can u please post the pic then it will be easier for me to solve...
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