Newton observed the action of a prism on white light and on red light. because he (did or did not) control the event, this investigation of light was ( a controlled experiment or a field study or an observational study or a simulation)

He did not control the event.

The investigation was an observational study.

Explanation:

A careful observation of the question given above,

Then context of the question suggests that Newton only observed the action of a prism on white light and on red light meaning he did not influence or control the event. Now, because he did not control the event, his investigation is only term observational study of the action of a prism on white light and on red light.

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answerscientific theory;