It doesn’t take much analysis to recognize that the distance the person stands from the mirror does NOT affect the results. The height of the mirror is 1.77 m−0.87 m=0.90 m. Therefore, the top of the mirror is 1.77 m above the floor and the bottom of the mirror is 0.87 m above the floor. The light ray that leaves the top of the person’s head and reflects from the mirror into his eyes must strike the mirror 3.0 cm below the top of his head. The distance from the person’s toes to eyes is 1.74 m, so the bottom of the mirror must be 0.87 m above the floor. From this, we know that the light ray leaving the person's toes will strike the mirror halfway between his toes and his eyes. The law of reflection tells us that the angle of incidence equals the angle of reflection. What is the minimum height of the mirror, and how high must its lower edge be above the floor for the person to be able to see his/her whole body? Assume the person’s eyes are 6.0 cm below the top of the head. To learn more about why images in a mirror appear to flip horizontally watch the video below:Ī person 1.80 m tall stands in front of a plane mirror. Although the images in a plane mirror appear to flip horizontally, it is actually a result of them reversing in depth along the z-axis (in and out). The image woman, however, appears to be holding the cleaning cloth in her right hand. The object woman has a cleaning cloth in her left hand. In the image above, you see a woman cleaning a mirror. When you look at an image of yourself in a plane mirror, there are some differences that are apparent. This image is called a virtual image because the light does not actually pass through the image. In a plane mirror, the image will be the same size as the object and will be the same distance behind the mirror as the object is in front of the mirror. Therefore, our eye and brain track the light rays backward to a position from which they appear to have come. When some of the light rays enter our eye, our eye and brain interpret these rays as having traveled in a straight line path. Light rays from the object strike the mirror and reflect according to the law of reflection. Plane mirrors work because the light rays create a virtual image behind the mirror. The sketch below shows how we see an image in a plane mirror. The light rays should obey the law of reflection for every attempt.\) AttemptĬompare the angle of incidence with the angle of reflection for each block. Repeat steps 2 - 8 for several different angles of incidence.Measure the angle of incidence and angle of reflection for the mirror.Join the crosses to show the paths of the light rays. Using a pencil on the paper, mark the path of:.The aim is to see a clear ray reflected from the surface of the mirror. Move the ray box or paper to change the angle of incidence. The angle between the normal and the incident ray is called the angle of incidence.Use the ray box to shine a ray of light at the point where the normal meets the mirror.Place a plane mirror against the first line.
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
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