![]() Light propagates in a straight line before, after, and during reflection. This phenomenon gives us a basis on which to view the environment. When the moon reflects from a lake, as shown in Figure 5, a combination of these effects takes place. The phenomenon, known as reflection or reflection of light, occurs when a light beam strikes any polished, smooth, or bright object and bounces back to our eyes. A mirror, on the other hand, has a smooth surface (compared with the wavelength of light) and reflects light at specific angles, as illustrated in Figure 4. Many objects, such as people, clothing, leaves, and walls, have rough surfaces and can be seen from all sides. Diffused light is what allows us to see a sheet of paper from any angle, as illustrated in Figure 3. Since the light strikes different parts of the surface at different angles, it is reflected in many different directions, or diffused. Possible student misconceptions: 1) A mirror or other smooth surface does not reflect light at a predictable angle. We expect to see reflections from smooth surfaces, but Figure 2 illustrates how a rough surface reflects light. The law of reflection is illustrated in Figure 1, which also shows how the angles are measured relative to the perpendicular to the surface at the point where the light ray strikes. A mirror, on the other hand, has a smooth surface (compared with the wavelength of light) and reflects light at specific angles, as illustrated in Figure 4. The angles are measured relative to the perpendicular to the surface at the point where the ray strikes the surface. The law of reflection states that the angle of reflection equals the angle of incidence- θr = θi. Examples to show that light travels in a straight line are light emitted by a torch light and light emitted from the headlights of a vehicle. ![]()
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