An object is kept at a distance of 20cm from a converging lens of focal length 10cm. What will be the magnification?
12
1
2
4
A
2
B
12
C
4
D
1
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Solution
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Given: u=-20 cm f=10 cm (concave lens) To find : magnification Solution : From Lens Formula 1v−1u=1f 1v+120=110 1v=110−120 1v=120 v=20cm So magnification for a lens is given by m=vu=20−20=1 m=−1
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