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Question


The graph between object distance u and image distance v for a lens is given. The focal length of the lens is
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A
5± 0.1 cm
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B
5± 0.05 cm
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C
0.5± 0.1 cm
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D
0.5 ±0.05 cm
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Solution

The correct option is D 5± 0.05 cm
1f=1v1u

(v=10cm,u=10cm) lies on curve

1f=110110

f=5cm

Now, calculating error
|dff2| =|dvv2| + |duu2|

dv=du =least count=0.1cm

therefore, |df|=25*[0.1100+0.1100 ]

df= ±0.05cm

Hence the answer : f= 5±0.05cm

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