Opticks : or, A treatise of the reflections, refractions, inflections and colours of light

In this landmark 18th‑century treatise the author sets out to uncover the behaviour of light without resorting to untested speculation. Beginning with clear definitions of rays and their capacity to bend when passing between transparent media, the work proceeds through a series of carefully described experiments on reflection, refraction and the formation of colours. The prose reflects the meticulous spirit of the Royal Society, inviting readers to follow the reasoning that shaped modern optics.

The later sections add thoughtful questions about lingering mysteries, such as the nature of gravity, and note where observations remain insufficient. By presenting both the successes and the gaps in knowledge, the author encourages a scientific dialogue that still resonates today. Listeners will hear a blend of rigorous logic and genuine curiosity that laid the groundwork for later discoveries in physics.