Human reaction time is usually greater than 0.10 s. If your friend holds a ruler between your
fingers and releases it without warning, how far
can you expect the ruler to fall before you catch it?

answer: the correct answer id option(d).

explanation:

snell's law refraction:

the angle of refraction =

the angle of incidence =

refractive index of air = = 1

refractive index of glycerol = 1.47

from the given options, the most closest answer to 63.72° is 65° of option (d).

asthenosphere and convection

it has to be b, about 97 percent.