An injured monkey sits perched on a tree branch 7.5 m above the ground, while a wildlife veterinarian is kneeling down in the bushes 86.0 m away attempting to subdue the monkey with a tranquilizer gun. the vet knows that the moment the gun fires, the monkey will be frightened and fall down from the branch. at what angle up from the ground must the veterinarian aim the gun so that the tranquilizer dart will hit the falling monkey?

b

explanation:

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.