A 2 meter long scale with least count of 0.2 ~cm 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 80 ~cm mark and 1 ~m mark, respectively. The image of the object pin on the other side of lens coincides with image pin that is kept at 180 ~cm mark. The% error in the estimation of focal length is:

Optics: JEE Main 2023 Physics question

JEE Main 2023 · 6 Apr, Evening shift · Q7052

JEE Main 20236 Apr, Evening shiftPhysicsHardOptics190× since 2002

A 2 meter long scale with least count of

0.2 \mathrm{~cm}

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

80 \mathrm{~cm}

mark and

1 \mathrm{~m}

mark, respectively. The image of the object pin on the other side of lens coincides with image pin that is kept at

180 \mathrm{~cm}

mark. The

\%

error in the estimation of focal length is:

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