Verification of the Inverse Square Law of Light

• Metallic Optical bench 90 cm with 4 mounted.
• Halogen lamp with holder.
• Power supply, 12V/3A
• Photo diode with holder.
• Digital multi meter.
• Connecting Cable.


In this experiment, we can Verify the inverse square law for electromagnetic waves, that is the intensity of the electromagnetic wave is inversely proportional to the square of the detector distance
I= 1/R²
I= intensity of light.
R= distance between Light source and detector.