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Physics · PYQ NEET UG 2026

हिन्दी

Which of the following measurements require 'index correction'?

  1. Measurement of resistance of a wire using meter bridge
  2. Measurement of gravitational acceleration using simple pendulum
  3. Measurement of focal length of lenses using optical bench
  4. Measurement of speed of sound using resonance tube

Correct answer · Option 3

Measurement of focal length of lenses using optical bench

Explanation

Index correction is applied in optical bench experiments when measuring the focal length of lenses due to the zero-error in the positions of the index marks on the optical needles or lenses.

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