Optics: : [op-tiks] - noun. A branch of physics that studies electromagnetic radiation (for example, light and infrared radiation), its interactions with matter, and instruments used to gather information due to these interactions.Optics includes the study of sight. branch of physics that studies electromagnetic radiation (for example, light and infrared radiation), its interactions with matter, and instruments used to gather information due to these interactions.
By 1924, the National Flag Conference, under the leadership of the American Legion and the Daughters of the American Revolution, changed the Pledge's words, 'my Flag,' to 'the Flag of the United States of America.'
pledge (third-person singular simple present pledges, present participle pledging, simple past and past participle pledged) 1  To make a solemn promise (to do something). 2  To deposit something as a security; to pawn. ( 3 transitive) To give assurance of friendship by the act of drinking; to drink to one's health.