Abeam of light is traveling through a medium at 200,000 km/s. it enters a different medium and speeds up to almost 250,000 km/s. finally, it enters a third medium and halts. what were the media the light traveled through, in order? !

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.

explanation:

the masses of the objects and the distance between them

graphing motion: mastery test

209be

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10 meters/second?

12 meters/second?

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20

time (seconds)

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