g How many helium-filled balloons would it take to lift a person? Assume the person has a mass of 73 kg and that each helium-filled balloon is spherical with a diameter of 33 cm. Express your answer using two significant figures.

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).

the entire statement is true and correct.  

there's no diagram, nothing is illustrated, and no question is asked.