Which of the following is derived unit?
a: g (grams, mass)
b: m (meters, length)
c: s (seconds, time)
d: m2 (square meters, area)

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