The speed of light in a transparent medium is 0.6 times that of its speed in vacuum. find the refractive index of the medium.

The refractive index is 1.66

The speed of light in a transparent medium is 0.6 times that of its speed in vacuum .

Refractive index of medium = speed of light in vacuum / speed of light in medium  

So

RI = 1/0.6 = 5/3 or 1.66

Refractive index is defined as

given that

v = 0.6 c

so we will have

the force on the thing and the distance the force moves the thing

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.