Law of reflection           Angle of incidence = angle of reflection  The normal line is at right angle to the mirror. . The angles of incidence and reflection are measured from the ray to the normal.   Normal      Laser laser produces an intense beam of light in which all of the waves are:         1. The same frequency and wavelength         2. In phase with each other Laser beam is used in a CD player by reflection from the shiny surface that contains digital information in the form of a patterns of pits.      Climate change         Human activity and natural phenomena both have effects on weather patterns.  Dust from volcanoes reflect radiation from the Sun and causes cooling. . Dust from factories reflect radiation from the city and causes warming.