A real image of an object fom1ed by a converging lens of focal length 15cm is three times the size of the object. What is the distance of the object from the lens?

a

30cm

b

25cm

c

20cm

d

15cm

e

10cm

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Correct Option
c

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Q.Man
3 years ago

V=3U
U=U
F=15

F=UV/U+V

15=U×3U/U+3U

15=3U²/4U

60U=3U²

60=3U

U=60/3

U=20cm

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