Isaac Newton did not formulate a theory of natural light in the modern sense. He did, however, make groundbreaking contributions to our understanding of light, which laid the foundation for later theories.

Here's what Newton did and didn't do regarding light:

Newton's Contributions:

* Corpuscular Theory of Light: Newton proposed that light was made up of tiny particles (corpuscles) emitted from luminous objects. This theory explained phenomena like reflection and refraction quite well.

* Dispersion of Light: Through his famous prism experiment, Newton demonstrated that white light is actually a composite of different colors, which are separated due to their differing refractive indices.

* Laws of Motion: Newton's laws of motion, while not directly related to light, were instrumental in developing our understanding of how objects interact with light.

What Newton Didn't Do:

* Wave Nature of Light: Although Newton's corpuscular theory was initially successful, it failed to explain other phenomena like diffraction and interference, which are better explained by the wave theory of light. This wave theory was later developed by Huygens, Young, and Fresnel.

* Electromagnetic Nature of Light: Newton's theory did not address the electromagnetic nature of light, which was only discovered much later by James Clerk Maxwell.

In conclusion:

While Newton's work was crucial in developing our understanding of light, it wasn't a complete theory. Later scientists built upon his work to develop more comprehensive theories that explained the wave nature and electromagnetic nature of light.