Draw the image with 2 rays only and form the image behind the mirror
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Drawing Ray Diagrams - a Step-by-Step Approach
This section of Lesson 2 details and illustrates the procedure for drawing ray diagrams. Let's begin with the task of drawing a ray diagram to show how Suzie will be able to see the image of the green object arrow in the diagram below. For simplicity sake, we will suppose that Suzie is viewing the image with her left eye closed. Thus, we will focus on how light travels from the two extremities of the object arrow (the left and right side) to the mirror and finally to Suzie's right eye as she sights at the image. The four steps of the process for drawing a ray diagram are listed, described and illustrated below.
1. Draw the image of the object.
Use the principle that the object distance is equal to the image distance to determine the exact location of the object. Pick one extreme on the object and carefully measure the distance from this extreme point to the mirror. Mark off the same distance on the opposite side of the mirror and mark the image of this extreme point. Repeat this process for all extremes on the object until you have determined the complete location and shape of the image. Note that all distance measurements should be made by measuring along a segment that is perpendicular to the mirror.
2. Pick one extreme on the image of the object and draw the reflected ray that will travel to the eye as it sights at this point.
Use the line of sight principle: the eye must sight along a line at the image of the object in order to see the image of the object. It is customary to draw a bold line for the reflected ray (from the mirror to the eye) and a dashed line as an extension of this reflected ray; the dashed line extends behind the mirror to the location of the image point. The reflected ray should have an arrowhead upon it to indicate the direction that the light is traveling. The arrowhead should be pointing towards the eye since the light is traveling from the mirror to the eye, thus enabling the eye to see the image.
3. Draw the incident ray for light traveling from the corresponding extreme on the object to the mirror.
The incident ray reflects at the mirror's surface according to the law of reflection. But rather than measuring angles, you can merely draw the incident ray from the extreme of the object to the point of incidence on the mirror's surface. Since you drew the reflected ray in step 2, the point of incidence has already been determined; the point of incidence is merely the point where the line of sight intersects the mirror's surface. Thus draw the incident ray from the extreme point to the point of incidence. Once more, be sure to draw an arrowhead upon the ray to indicate its direction of travel. The arrowhead should be pointing towards the mirror since light travels from the object to the mirror.
4. Repeat steps 2 and 3 for all other extremities on the object.
After completing steps 2 and 3, you have only shown how light travels from a single extreme on the object to the mirror and finally to the eye. You will also have to show how light travels from the other extremes on the object to the eye. This is merely a matter of repeating steps 2 and 3 for each individual extreme. Once repeated for each extreme, your ray diagram is complete.
1. Draw the image of the object.
Use the principle that the object distance is equal to the image distance to determine the exact location of the object. Pick one extreme on the object and carefully measure the distance from this extreme point to the mirror. Mark off the same distance on the opposite side of the mirror and mark the image of this extreme point. Repeat this process for all extremes on the object until you have determined the complete location and shape of the image. Note that all distance measurements should be made by measuring along a segment that is perpendicular to the mirror.
2. Pick one extreme on the image of the object and draw the reflected ray that will travel to the eye as it sights at this point.
Use the line of sight principle: the eye must sight along a line at the image of the object in order to see the image of the object. It is customary to draw a bold line for the reflected ray (from the mirror to the eye) and a dashed line as an extension of this reflected ray; the dashed line extends behind the mirror to the location of the image point. The reflected ray should have an arrowhead upon it to indicate the direction that the light is traveling. The arrowhead should be pointing towards the eye since the light is traveling from the mirror to the eye, thus enabling the eye to see the image.
3. Draw the incident ray for light traveling from the corresponding extreme on the object to the mirror.
4. Repeat steps 2 and 3 for all other extremities on the object.