NEET 2026 Physics question

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 benchCorrect
(4)Measurement of speed of sound using resonance tube

Answer: (3)

Solution

Index correction is the correction applied to object/image distances on an optical bench, because the positions of the lens/object pins read on the scale are not exactly at the true positions marked by the index (pointer) rods. Meter bridge

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Question ID VK-105006