<prompt> bala sekhahla sa liketsahalo joang?nan  <response>: Instruction in English: How do you calculate the angle of incidence? . Response in English: The angle of incidence is the angle at which a light ray or wave approaches and strikes a surface. To calculate the angle of incidence, you first have to identify a perpendicular line or normal to the surface where the incoming ray hits. This normal line should make a 90-degree angle with the surface. Then, measure the angle between the normal line and the incoming light ray or wave. This will give you the angle of incidence. Its important to note that the angle is measured between the incoming light ray and the normal line, and not between the light ray and the surface itself. . Response in Sesotho: The angle of incidence ke khutlo eo lehlaseli la leseli kapa leqhubu le atamelang ho lona le ho otla bokaholimo. Ho bala angle ea liketsahalo, u tlameha ho qala ka ho tseba mohala oa perpendicular kapa o tloaelehileng ho ea holimo moo mahlaseli a kenang a otlang teng. Mohala ona o tloaelehileng o lokela ho etsa angle ea 90-degree le bokaholimo. Ebe, lekanya angle pakeng tsa mola o tloaelehileng le lehlaseli le kenang kapa leqhubu. Sena se tla u fa angle ea liketsahalo. Ke habohlokoa ho hlokomela hore angle e lekanngoa pakeng tsa mahlaseli a khanyang a kenang le mohala o tloaelehileng, eseng pakeng tsa mahlaseli a khanyang le bokaholimo ka bobona. 