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CGPET 2015 Solved Paper
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© examsnet.com
Question : 12
Total: 150
A convex lens of focal length
0.12
m
produces an image, which is three times as long as the object. The distance between the object and the lens for a real image
0.16
m
−
0.16
m
1.6
m
−
1.6
m
Validate
Solution:
Magnification produced by the lens
m
=
v
u
=
−
3
⇒
v
=
−
3
u
Applying lens of formula, we have
1
v
−
1
u
=
1
f
⇒
1
−
3
u
−
1
u
=
1
0.12
or
−
1
−
3
3
u
=
100
12
=
25
3
or
−
4
3
u
=
25
3
or
u
=
−
4
25
m
⇒
=
0.16
m
© examsnet.com
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