![]() (In the video, the latter is sometimes referred to as the ‘angle of reflectance’.) Understanding how these angles relate to one another is crucial to capturing successful photographs. It explains why you can see a clear image of yourself in a shiny flat mirror, but not in a dull rough wall. After describing the four different types of reflection, Karl goes on to explain the angle of incidence and the angle of reflection. Instead, the light is reflected in all directions. According to the law of reflection, the angle of incidence equals the angle of reflection. However, the different parts of the rough surface point in different directions, so the light is not all reflected in one direction. The angle of incidence is the angle between this normal and the incident ray the angle of reflection is the angle between this normal and the reflected ray. If light meets a rough surface, each ray obeys the law of reflection. The reflection of light from a flat surface such as a mirror is called specular reflection – light meeting the surface in one direction is all reflected in one direction. In the second example, if a light ray travelling along the normal hits a mirror, it is reflected straight back the way it came. the angle of reflection is 90° if the angle of incidence is 90°.the angle of reflection is 30° if the angle of incidence is 30°.The law of reflection states that the angle of incidence equals the angle of reflection, i = r. the angle of reflection, r, is the angle between the normal and reflected ray.the angle of incidence, i, is the angle between the normal and incident ray.the dashed line is called the normal, drawn at 90° to the surface of the mirror After describing the four different types of reflection, Karl goes on to explain the angle of incidence and the angle of reflection.Apparatus for angles of incidence and reflection. the hatched vertical line on the right represents the mirror In a perfectly elastic impact, the angle of reflection is equal to the angle of incidence. ![]() the reflected ray is the light coming away from the mirror.the incident ray is the light going towards the mirror.When light reaches a mirror, it reflects off the surface of the mirror: Remember to use a ruler and a sharp pencil. with an arrowhead pointing in the direction that the light travels.A ray diagram shows how light travels, including what happens when it reaches a surface.
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