PHYA22H3 Chapter 23: PHYA22 Chapter 23.doc

• School: UTSC
• Department: Physics and Astrophysics
• Course: PHYA22H3
• Professor: Brian Wilson

Document Summary

Light ray: a line in the direction along which light energy is flowing: a laser beam is a bundle of many parallel light rays, ray model of light: o. Light rays travel in straight lines, where v = c/n, where n is the index of refraction. o. Light rays can cross: two rays can cross without either being affected in any way: a light ray travels forever unless interacts with matter which causes the light ray to change direction or to be absorbed. At an interface between two materials, light can be reflected or refracted. Specular reflection: reflection from a flat, smooth surface like a mirror or polished metal. i): between the ray and a line perpendicular to the r): the angle between the reflected ray and the normal. Reflection: angle of incidence (q, angle of reflection (q surface, the normal to the surface. to the surface.