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.'
Originally composed by Colonel George Balch in 1887, The Pledge of Allegiance was later revised by Francis Bellamy in 1892 and formally adopted by Congress in 1942. The Pledge is an expression of allegiance to the Flag of the United States and the republic of the United States of America.