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how to measure the speed of light with a laser. Subsequent methods to measure the speed of light of which Albert Michelson was a prominent practitioner relied on wave interference. The laser is characterized by its small spectral band width and angular divergence resulting in a large spectral radiance per unit band width.
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We use a 1 mW laser pointer of adjustable focus as the signal carrier a signal generator up to 100 kHz 6 V 1 A. To measure the speed of light would require an external definition of what a meter is and since about the 1970s we dont have one. Replicating the Fizeau Apparatus - Duration.
Start with the polarizers completely crossed then rotate one until the image in the microscope is bright enough to be visible.
Measuring the speed of light the old fashioned way. Speed of light The speed of light is measured using a time-of-flight method over a distance of 20 cm using a high speed pulsed laser a beam splitter mirrors and fast detectors and oscilloscope. Bring the cross-hairs of the microscope into focus by sliding the microscope eyepiece up and down. Focus the microscope by loosening the lock- screw and sliding the scope up and down.
