A classical experiment to determine the speed of light in air.

• 1MHz internal modulation frequency
• Dual photo detector

Principle and Working:
The LASER beam from the Transmitter strikes the Beam Splitter to split the beam in two perpendicular directions. The first beam is transmitted through Transmitter directly and is received in first channel of the receiver. The second perpendicular beam from Beam Splitter travels a larger distance by being reflected back from a mirror placed about 5 meter or more and is received in second channel of the receiver. In the present setup, the time difference between the two peaks of received LASER signals can be observed on a oscilloscope (>40MHz) and can be used to calculate the Speed of Light.