8. The diagram below shows A beaker of cooking oil and water. A light ray is about to enter the cooking oil. Drawing the path of the light ray.
3.0x108 m/s is the air level
2.0x108 m/s is the oil level
2.25x108 m/s is the water level

the answer is definitely c.

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.

snell's law

refractve index = sin incidence / sin refraction