Newton ovserved the action of the prism on white light and on red light because

Newton observed the action of a prism on white light and on red light. Because he did control the event, this investigation of light was a controlled experiment. Explanation: ... Many years before Newton, one had the idea that the white light gave rise to a colored beam when it crossed a prism of glass.

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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.