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# An object is kept at a distance of 20cm from a converging lens of focal length 10cm. What will be the magnification?12124

A
2
B
12
C
4
D
1
Solution
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#### Given: u=-20 cm f=10 cm (concave lens)To find : magnificationSolution : From Lens Formula1v−1u=1f1v+120=1101v=110−1201v=120v=20cmSo magnification for a lens is given bym=vu=20−20=1m=−1

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