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. 1  to present as security or guarantee, esp. for the repayment of a loan; pawn. 2  to drink a toast to. 3  to bind by a promise or agreement. 4  to promise to give: to pledge allegiance, pledge money to a fund. 5  to accept tentative membership in (a fraternity, etc.) to accept as a pledge (noun)