Ray Optics and Optical InstrumentsOptical bench - index correction 1 2026 Re-NEET Easy Which of the following measurements require 'index correction'? A Measurement of resistance of a wire using meter bridge B Measurement of gravitational acceleration using simple pendulum C Measurement of focal length of lenses using optical bench D Measurement of speed of sound using resonance tube Check Answer Detailed Solution Index correction (also known as bench correction) is applied in the optical bench experiment, which is used to find the focal length of lenses.