PART-I PHYSICS
SECTION-A
A 2-meter-long scale with least count of 
is used to measure the locations of objects on an optical bench. While measuring the focal length of a convex lens, the object pin and the convex lens are placed at 
mark and lm mark, respectively. The image of the object pin on the other side of lens coincides with image pin that is kept at 
mark. The % error in the estimation of focal length is:
Text Solution
Verified by ExpertsC
Least count 
From lens formula,
Also 
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