Oh, before I even turn that on, one of the things that we did about three weeks ago in my class — this is through the lens, and one of the things we used a lens for was to measure the speed of light.
Ah, antes incluso de encenderlo, una de las cosas que hicimos hace tres semanas en mi clase, esto es a través del lente, y una de las cosas para la que usamos un lente es para medir la velocidad de la luz.