La luz pasa del medio a al medio b formando un ángulo de 35° con la frontera horizontal entre ambos. si el ángulo de refracción también es de 35°, ? cuál es el índice de refracción relativo entre los dos medios?

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration

Hunter is in lab. he clears a spot on his lab bench to start working. he also puts his lab coat and goggles on. he then identifies where all of the safety equipment is. he notices his station is next to the fume hood, which ventilates the chemicals stored there. the noise of the fume hood was bothersome, so hunter turned it off. which could be an error in his set-up? he should not turn off the fume hood.  he should wait to put on his coat until after the directions are given.  he should wait to put on his goggles until after the directions are given.  he should not sit next to the fume hood. 

Group of elements with the same number of valence electrons