The part of optics dealing with the ray aspect of light is called geometric optics The changing of a light ray’s direction when it passes through variations in matter is called refraction

A straight line that originates at some point is called a ray Light can travel in three ways from a source to another location: (1) directly from the source through empty space; (2) through various media; (3) after being reflected from a mirror

geometric optics — part of optics dealing with the ray aspect of light. mirror — smooth surface that reflects light at specific angles, forming an image of the person or object in front of it. refraction — changing of a light ray’s direction when it passes through variations in matter. ray — straight line that originates at some point.