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. and since the angle of incidence equals the angle of reflection. (iv) Calculate the angle made by the incident and reflected rays. the angle between the incident ray and the reflecting surface must equal the angle. Many objects, such as people, clothing, leaves, and walls, have rough surfaces and can be seen from all sides. (iii) Calculate the angle made by the reflected ray and the surface. With the pencil mark two Xs to indicate the direction of the emergent ray. This is the incident ray for the angle of incidence, i 100. Diffused light is what allows us to see a sheet of paper from any angle, as illustrated in Figure 3. Direct a narrow ray of light along the line marked A. 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. Thus, the angle of incidence is equal to the angle of reflection for visible light as well as for all other wavelengths of the electromagnetic radiation. The angles are measured relative to the perpendicular to the surface at the point where the ray strikes the surface. The angle of refraction cannot be greater than. 1 that the angles of incidence i and reflection i are equal by joining the two angles with an equal sign. (e) can be less than, greater than, or equal to angle of incidence. 1) at right angles to the mirror located at the point where the rays meet. For refracted light rays, the angle of refraction: (a) is always equal to the. We define the angle of incidence as the angle between the incident ray and the. When the angle of refraction is equal to 90, the angle of incidence is called the critical angle, c. The law of reflection requires that two rays are at identical angles but on opposite sides of the normal which is an imaginary line (dashed in Fig. The law of reflection states that the angle of reflection equals the angle of incidence- θr = θi. We consider a light wave travelling through medium 1 and striking medium 2.
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