I'm done, so done, I'm done with all the games you play I'm numb, so numb, I'm numb to all the pain you bring
I'm tryna figure this all out for myself
I don't need you or nobody else, I'm done, so done
So done, so done, so done, so done, I'm done
(Oh, no, no-no-no, no-no-no)

depressewd vibes.

oh lord help these fake depressed kids

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.