The best analogy for light energy is: â a. âthe propagation of waves in the ocean b. âa rabbit hoping along a path c. âraindrops falling from the sky d. âa plane flying through the air

I believe that the correct answer for this question is:

a. the propagation of waves in the ocean

This is because like waves in form, light has two polarities in shape. It actually forms a sinusoidal wave like a wave in the ocean.

12000j is work done

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.