What scientist first discovered that white light is a mixture of a rainbow spectrum of light rays

Newton also understood that white light can be separated into its components because each ray of color is deviated by the glass of the prism by a different amount. He realized, for example, that red light is consistently less deviated than violet light.

Issac Newton is the correct answer.

object 2 because all the other ones are wrong

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray