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VITEEE 2013 Solved Paper
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© examsnet.com
Question : 29
Total: 120
A students plots a graph between inverse of magnification 1/m produced by a convex thin lens and the object distance u as shown in figure. What was the focal length of the lens used?
b
c
a
b
c
a
c
b
b
c
Validate
Solution:
Lens formula
1
v
−
1
u
=
1
f
or
u
v
- 1 =
u
f
⇒
1
m
- 1 =
u
f
or
1
m
=
(
1
f
)
u + 1
this is the equation of a straight line whose slope
1
f
=
b
c
∴ f =
c
b
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