Physics · 2023
JEE Main · 30 January 2023, Shift 1 · Q29
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…
In an experiment for estimating the value of focal length of converging mirror, image of an object placed at $\displaystyle 40$ cm from the pole of the mirror is formed at distance $\displaystyle 120$ cm from the pole of the mirror. These distances are measured with a modified scale in which there are $\displaystyle 20$ small divisions in $\displaystyle 1$ cm . The value of error in measurement of focal length of the mirror is $\displaystyle \frac{1}{\mathrm{~K}} \mathrm{~cm}$. The value of K is
$\displaystyle \_\_\_\_$.
Official answer
From NTA’s final answer key for this paper.
32
All Errors, Significant Figures and Measuring Instruments questionsPractice Errors, Significant Figures and Measuring Instruments →
More from Errors, Significant Figures and Measuring Instruments
- Two resistances are given as R_1=(10 ± 0.5) Ω and R_2=(15 ± 0.5) Ω. The percentage error in the measurement of equivalent resistance when they are…2023
- The density ρ of a uniform cylinder is determined by measuring its mass m, length l and diameter d. The measured values of m, l and d are 97.42 ±…2026
- In a screw gauge the zero of main scale reference line coincides with the fifth division of the circular scale when two studs are in contact. There…2026
- Identify the physical quantity that cannot be measured using spherometer:2024
- In an experiment the values of two spring constants were measured as k_1=(10 ± 0.2) N / m and k_2=(20 ± 0.3) N / m. If these springs are connected in…2026
- For the determination of refractive index of glass slab, a travelling microscope is used whose main scale contains 300 equal divisions equals to 15…2025
- The energy of a system is given as E(t)=α^3 e^-β t, where t is the time and β=0.3 s^-1. The errors in the measurement of α and t are 1.2\% and 1.6\%,…2025
- The diameter of a wire measured by a screw gauge of least count 0.001 cm is 0.08 cm. The length measured by a scale of least count 0.1 cm is 150 cm.…2026
JEE Main 2023 Physics question, with the answer from NTA’s final answer key. Where our answers come from.