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JEE Main Physics Class 12 Ray Optics and Optical Instruments Part 1 Questions
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© examsnet.com
Question : 86
Total: 99
A student measures the focal length of a convex lens by putting an object pin at a distance ‘u’ from the lens and measuring the distance ‘v’ of the image pin. The graph between ‘u’ and ‘v’ plotted by the student should look like
[2008]
Validate
Solution:
From the lens formula
1
f
=
1
v
−
1
u
This graph suggest that when
u
=
−
f
,
v
=
+
∞
When
u
is at
−
∞
,
v
=
f
.
When the object is moved further away from the lens, v decreases but remains positive.
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