Physics · 2023
JEE Main · 6 April 2023, Shift 2 · Q31
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 $\displaystyle 2$ meter long scale with least count of $\displaystyle 0.2$ 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 $\displaystyle 80$ cm mark and $\displaystyle 1$ m mark, respectively. The image of the object pin on the other side of lens coincides with image pin that is kept at $\displaystyle 180$ cm mark. The % error in the estimation of focal length is:
Official answer
From NTA’s final answer key for this paper.
(4)
$\displaystyle 1.70$
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JEE Main 2023 Physics question, with the answer from NTA’s final answer key. Where our answers come from.