If you go to a nutrition store and buy a supplement, You can count on the fact that it is pure and safe because supplements are regulated, controlled, and it's spected by the fda true or false

Abeam of light shining from water to air strikes the surface at an angle greater than 48 degrees and produces total internal reflection. if the incident beam is at a 50 degree angle what angle is the reflected beam 13 25 50 100