Quick Answer: Optical Spot Reflecting Galvanometer is a sensitive current detector in which a mirror on the moving system reflects a light spot onto a scale, so very small currents show as visible spot movement.
Last updated: October 2026
Key Features
Mirror-based optical indication magnifies small coil deflections
Detects very small electric currents
Used as a null detector in bridge and potentiometer experiments
Zero is set by adjusting the reflected light spot before the circuit is energised
Needs a stable, vibration-free bench
About This Product
Where an ordinary pointer galvanometer is not sensitive enough, this instrument is used for null-deflection work, resistance comparison and electromagnetic induction practicals with advanced physics lab equipment. Students set the reflected spot to zero, apply current gradually and record the deflection once the spot settles, which also shows how optics can magnify a tiny coil movement. Like any sensitive instrument in Lab Meters, it must never be connected directly across a power source, and protective resistance is used where required.
Frequently Asked Questions
Q1. How does a reflecting galvanometer show current? A mirror is attached to or associated with the moving system. When current deflects the coil, the reflected light spot moves along a scale, which makes small deflections easier to see.
Q2. Can the galvanometer be connected directly to a battery? No. Direct connection can overload the coil. Use the approved circuit with protective resistance and instructor supervision.
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