[ noun ] (physics) a column of light (as from a beacon)
Used in print(Francis J. Johnston and John E. Willard, "The...)
The round cells were reproducibly positioned in the light_beam which entered the thermostated mineral_oil bath through a window .(A. N. Nagaraj and L. M. Black, "Localization of...)
The light_beam from the lamp was filtered through a half standard thickness Corning 1840 filter .