The law of reflection states that the angle of reflection equals the angle of incidence- θ r = θ i. When the moon reflects from a lake, as shown in Figure 5, a combination of these effects takes place. 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. 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. Large telescopes use reflection to form an image of stars and other astronomical objects. When you look at this page, too, you are seeing light reflected from it. Whenever we look into a mirror, or squint at sunlight glinting from a lake, we are seeing a reflection.
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