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 (law) For other uses, see Pledge (disambiguation). A pledge is a bailment that conveys possessory title to property owned by a debtor (the pledgor) to a creditor (the pledgee) to secure repayment for some debt or obligation and to the mutual benefit of both parties. The term is also used to denote the property which constitutes the security.