A lens A mirror A prism A telescope
I gave my students this multiple choice question: In the 1600s Sir Isaac Newton discovered that sunlight is made up of all the colors of the rainbow. What tool did Sir Isaac Newton most likely use to make his discovery?

Only one answer is correct among these 4 choices:
- A lens
- A mirror
- A prism
- A telescope

Could you tell me which one is correct?

A prism