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.'
The current Pledge reads: I pledge allegiance to the flag of the United States of America, and to the Republic for which it stands; one nation under God, indivisible, with liberty and justice for all.. The Pledge is recited, on average, tens of millions of times a day -- largely by students in schools across America.