A mother and daughter's realization of the different reflection produced by a mirror, despite a visible item not being in front of the mirror, has left the internet confused. In a viral video, the ...

McPherson (Chelmsford MA USA) is pleased to announce a new vacuum ultraviolet spectral test system VUV-STS. The new system measures reflectance as a function of angle of incidence. It measures optical ...

It is late September, and the autumnal equinox has arrived. That gets me to thinking even more than usual about sun angle. Noticing differences in sun angle during different times of year and ...