SIR JOSEPH LARMOR has kindly pointed out to me that it is incorrect, in the interpretation of Fizeau's experiment, to assume that the velocity of propagation of light is the group velocity, so that I ...

Due to their stable design, Fizeau interferometers are used to determine the topography of surfaces such as, e.g., plane surfaces. PTB has now developed a method which makes it possible to analyze ...

A COMPARISON of the values given by Professor Ångström (in his magnificent Recherches sur le spectre solaire) for the wave-lengths corresponding to the two principal components of Fraunhofer's line D, ...

Fizeau's fringes occur in interferometry. Fizeau's fringes occur in interferometry. One of the most common methods used to test the flatness of a polished surface is by analysing the interference ...