<P> Fizeau -- Foucault apparatus is a term sometimes used to refer to two types of instrument historically used to measure the speed of light . The conflation of the two instrument types arises in part because Hippolyte Fizeau and Léon Foucault had originally been friends and collaborators . They worked together on such projects as using the Daguerreotype process to take images of the Sun between 1843 and 1845 and characterizing absorption bands in the infrared spectrum of sunlight in 1847 . </P>
<P> Fizeau -- Foucault apparatus is a term sometimes used to refer to two types of instrument historically used to measure the speed of light . The conflation of the two instrument types arises in part because Hippolyte Fizeau and Léon Foucault had originally been friends and collaborators . They worked together on such projects as using the Daguerreotype process to take images of the Sun between 1843 and 1845 and characterizing absorption bands in the infrared spectrum of sunlight in 1847 . </P>
which instrument is used to measure the speed of light
which instrument is used to measure the speed of light
Fizeau -- Foucault apparatus
Fizeau -- Foucault apparatus