Meaning: optical properties; "the optics of a telescope"
Meaning: the branch of physics that studies the physical properties of light
He lectured first on optics, giving an account of his experiments.
So everything but brooding had to be abandoned as too expensive, and he proceeded to study optics.
The year after the plague, in 1667, Newton returned to Trinity College, and there continued his experiments on optics.
He now began to turn his attention to optics, and, as was usual with him, his whole mind became absorbed in this subject as if nothing else had ever occupied him.
Photography has given us proofs of the incomparable beauty of our satellite; all is known regarding the moon which mathematical science, astronomy, geology, and optics can learn about her.
The first part of the work having been done, any ordinary mortal would have proceeded to publish it; but the fact is that after he had sent to the Royal Society his papers on optics, there had arisen controversies and objections; most of them rather paltry, to which he felt compelled to find answers.