Objective: Determine the velocity of light from the transit time of short light pulses
The fact that light is propagated at a finite speed can be demonstrated by a simple transit time measurement. This is achieved by using very short light pulses of only a few nanoseconds duration and determining the time for them to travel out and back over a distance of several metres, which is measured by an oscilloscope. From the transit time and the distance from the transmitter to a triple-prism reflector one can calculate the velocity of light.
![实验：光速的测定
(115 V, 50/60 Hz), 8000694 [UE4060100-115], Velocity of light](/imagelibrary/UE4060100-115/UE4060100-115_01_实验-光速的测定-115-V-5060-Hz.jpg)
![实验：光速的测定
(115 V, 50/60 Hz), 8000694 [UE4060100-115], Velocity of light](/thumblibrary/UE4060100-115/UE4060100-115_01_1200_1200_实验-光速的测定-115-V-5060-Hz.jpg)
