In an experiment for estimating the value of focal length of converging mirror, image of an object placed at 40 ~cm from the pole of the mirror is formed at distance 120 ~cm from the pole of the mirror. These distances are measured with a modified scale in which there are 20 small divisions in 1 ~cm. The value of error in measurement of focal length of the mirror is 1/(~K) ~cm. The value of K is _ _ _ _ _.

Optics: JEE Main 2023 Physics question

JEE Main 2023 · 30 Jan, Morning shift · Q66

JEE Main 202330 Jan, Morning shiftPhysicsHardOptics190× since 2002

In an experiment for estimating the value of focal length of converging mirror, image of an object placed at

40 \mathrm{~cm}

from the pole of the mirror is formed at distance

120 \mathrm{~cm}

from the pole of the mirror. These distances are measured with a modified scale in which there are 20 small divisions in

1 \mathrm{~cm}

. The value of error in measurement of focal length of the mirror is

\frac{1}{\mathrm{~K}} \mathrm{~cm}

. The value of

\mathrm{K}

is __________.

Your answerType your answer. Integers and decimals are accepted.

JEE Main 2023 Optics Question with Answer (30 Jan Morning shift, Q66) | JEE Arc