Two rays continue to diverge at the same angle after reflection. Take a piece of paper and shine a flashlight at an angle at the paper, as shown in Figure 3. What is the angle of reflection?
It is because of the law of reflection that an eye must sight at the image location in order to see the image of an object in a mirror. You will need to draw lines on a piece of paper showing the incident and reflected rays.
When we see ourselves in a mirror, it appears that our image is actually behind the mirror. The image appears to be in the direction the rays are coming from when they enter the eyes. As you sight at the image, light travels to your eye along the path shown in the diagram below. At the point of incidence where the ray strikes the mirror, a line can be drawn perpendicular to the surface of the mirror.
A corner reflector sends the reflected ray back in a direction parallel to the incident ray, independent of incoming direction. When a sheet of paper is illuminated with many parallel incident rays, it can be seen at many different angles, because its surface is rough and diffuses the light.
The normal line divides the angle between the incident ray and the reflected ray into two equal angles. Using the mirror and flashlight, can you confirm the law of reflection?
Follow Us. In fact, in each case, the image is not seen when sighting along the indicated line of sight.
Diffused light is what allows us to see a sheet of paper from any angle, as illustrated in Figure 3. Trace the path of the light ray as it bounces off the mirror.
The reason for this will be discussed later in Lesson 2. This derivation makes use of the calculus of maximum-minimum determination and the definitions of the triangle trig functions. Licenses and Attributions. Angle B is the angle of incidence angle between the incident ray and the normal.
Continue tracing the ray until it finally exits from the mirror system. What is the law of reflection?