Measure the angle of incidence and the angle of reflection. The angle between the normal and the reflected ray is known as the angle of reflection (∠r). The angle between the normal and incident ray is called the angle of incidence (∠i). This line is known as the normal to the reflecting surface at that point. Draw a line making an angle of 90º to the line representing the mirror at the point where the incident ray strikes the mirror. For simplicity, we use the term ray for a narrow beam of light.ĭraw lines showing the position of the plane mirror, the incident ray and the reflected ray on the paper with the help of your friends. In reality, we have a narrow beam of light which is made up of several rays. The ray that comes back from the sur face after reflection is known as the reflected ray.Ī ray of light is an idealization. The light ray, which strikes any surface, is called the incident ray. Īfter striking the mirror, the ray of light is reflected in another direction. Place a strip of plane mirror in the path of the light ray. With slight adjustment of the torch and the comb you will see a ray of light along the paper on the other side of the comb. Throw light from a torch through the opening of the comb from one side. Hold the comb perpendicular to the sheet of paper. You can use a strip of black paper for this purpose. Take a comb and close all its openings except one in the middle. Laws of Reflectionįix a white sheet of paper on a drawing board or a table. Can you tell in which direction the light falling on a surface will be reflected? Let us find out. A mirror changes the direction of light that falls on it. The light may have been emitted by the object, or may have been reflected by it.Ī polished or a shiny surface can act as a mirror. It is only when light from an object enters our eyes that we see the object. But, can you see an object in the dark? It means that eyes alone cannot see any object. Have you ever thought how we see the various objects? You may say that eyes see the objects. You are able to see the words and sentences printed on this page. We also see clouds, rainbows and birds flying in the sky. Through it we see mountains, rivers, trees, plants, chairs, people and so many other things around us.
The sense of sight is one of the most important senses.
The light rays should obey the law of reflection for every attempt.The world is largely known through the senses. AttemptĬompare the angle of incidence with the angle of reflection for each block.
Label this line with an ‘N’ for ‘normal’. Use a protractor to draw a second line at right angles to this line. Draw a straight line parallel to its longer sides. Place a 30 centimetre (cm) ruler near the middle of a piece of plain A3 paper.Set up a ray box, slit and lens so that a narrow ray of light is produced.To investigate the reflection of light by a plane mirror. Reflecting light experiment - plane mirror Investigation of reflection with a plane mirror Aim of the experiment
0 kommentar(er)
