Q. Which of the following measurements require 'index correction'?
A) Measurement of speed of sound using resonance tube
B) Measurement of resistance of a wire using meter bridge
C) Measurement of gravitational acceleration using simple pendulum
D) Measurement of focal length of lenses using optical bench
Explanation
[Solution from source] Index correction is applied on an optical bench, where the distance read between the index marks on the uprights differs from the actual distance between the lens and the needle. The resonance tube and metre bridge need end corrections instead. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.