Changes

===Optics===

===Optics===

While waiting out the plague he began to investigate the nature of light. White light, according to the prevailing theories, was homogeneous. His first experiments with a prism provided the true explanation of color. Passing a beam of sunlight through a prism, he observed that the beam spread out into a colored band of light (spectrum). While others had undoubtedly performed similar experiments, it was Newton who showed that the differences in color were caused by differing degrees of refrangibility. A ray of violet light, for example, when passed through a refracting medium, was refracted through a greater angle than a ray of red light. His conclusions, checked by ingenious experiments, were that sunlight was a combination of all the colors and that the colors themselves were monochromatic (his term was "homogeneal"), and separated merely because they were of differing refrangibility.

While waiting out [[The Plague]] he began to investigate the nature of [[light]]. White light, according to the prevailing theories, was homogeneous. His first experiments with a [[prism]] provided the true explanation of color. Passing a beam of sunlight through a prism, he observed that the beam spread out into a colored band of light ([[spectrum]]) like a rainbow. While others had undoubtedly performed similar experiments, it was Newton who showed that the differences in color were caused by differing degrees of [[refrangibility]]. A ray of violet light, for example, when passed through a [[refract]]ing medium, was refracted through a greater angle than a ray of red light. His conclusions, checked by ingenious experiments, were that sunlight was a combination of all the colors and that the colors themselves were monochromatic (his term was "homogeneal"), and separated merely because they were of differing refrangibility.

== Gravity ==

== Gravity ==