Angle of reflection equals angle of incidence
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The law of reflection is very simple: The angle of reflection equals the angle of incidence. Moonlight is spread out when it is reflected by the lake, since the surface is shiny but uneven. Only the observer at a particular angle will see the reflected light. A mirror illuminated by many parallel rays reflects them in only one direction, since its surface is very smooth. 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. Here many parallel rays are incident, but they are reflected at many different angles since the surface is rough. Light is diffused when it reflects from a rough surface. 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- 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. Explain reflection of light from polished and rough surfaces.
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Q.17 (a) Find out the position of the image of an object situated at A in the plane mirror (Fig.Can he see himself in the mirror? Also can he see the image of objects situated at P, Q and R? Q.16 Boojho stands at A just on the side of a plane mirror as shown in Fig.Draw the reflected ray from the second mirror. A ray of light is incident on one at an angle of 30° as shown in Fig. Q.15 Two mirrors meet at right angles.Q.14 How many images of a candle will be formed if it is placed between two parallel plane mirrors separated by 40 cm?.Q.12 Explain how you can take care of your eyes.Can you explain the basis of the teacher’s advise? Q.11 Gurmit wanted to perform Activity 16.8 using a laser torch.Q.10 Draw a labelled sketch of the human eye.Q.9 Describe the construction of a kaleidoscope.(d) real, behind the mirror and of the same size as the object. (c) real at the surface of the mirror and enlarged. (b) virtual, behind the mirror and of the same size as the object. (a) virtual, behind the mirror and enlarged. Q.7 The angle of incidence is equal to the angle of reflection.(d) Night birds have _ cones than rods in their eyes. (c) The size of the pupil becomes _ when you see in dim light. (b) If you touch your _ ear with a right hand in front of a plane mirror it will be seen in the mirror that your right ear is touched with _ (a) A person 1 m in front of a plane mirror seems to be _ m away from his image. Q.6 Fill in the blanks in the following.Q.5 Describe an activity to show that the incident ray, the reflected ray and the normal at the point of incidence lie in the same plane.(d) Marble floor with water spread over it Q.3 Mention against each of the following whether regular or diffused reflection will take place when a beam of light strikes.Does diffused reflection mean the failure of the laws of reflection? Q.2 Differentiate between regular and diffused reflection.Can you see objects in the room? Can you see objects out¬side the room ? NCERT solutions of related questions for Light