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 -
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
For a convex lens
u = –ve f = +ve
If v = ∞ , u = f and if u = – ∞ , v = f.
v = ∞ , u = f u = – ∞ , v = f.
We have v = +ve and u = –ve
and u and v are symmetrical. Hence graph is shown,
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