+18 Speed Of Light Discovered By 2023. Web the speed of light in vacuum is defined to be exactly 299 792 458. Many other methods were subsequently employed to further improve the accuracy of the measurement of c, so that it soon became necessary to correct for the refractive index of air since c is light's speed in a vacuum.
That's about 186,282 miles per second — a universal constant known in equations as c,. Web in this article, i will discuss how it was discovered that the speed of light is not infinite, and how it was measured. Web in 1907 rosa and dorsey obtained 299,788 km/s in this way.
