LOCATING IMAGES IN A PLANE MIRROR
Inquiry:
Part A - Drawing an Image Point
Object
First Ray
1. Draw an incident ray from the object to some point of incidence on the mirror.
2. Draw the point of incidence.
3. Draw the normal from the point of incidence.
4. Measure the angle of incidence, and then draw the reflected ray.
5. Extend the reflected ray behind the mirror. Use a dashed line behind the mirror.
Second Ray (use a different colour if possible)
1. Draw a second incident ray from the object to some other point of incidence on the mirror.
2. Draw the new point of incidence.
3. Draw the normal from this new point of incidence.
4. Measure the angle of incidence, and then draw the new reflected ray.
5. Extend this reflected ray behind the mirror. Use a dashed line behind the mirror.
The point where the two extended rays cross behind the mirror is where the image of the
object should be located. Label it I.
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Practice – Determine the image for each of the following points. Label the images I1 and I2.
O1
O2
Measure the distance from each object to its image. What do you notice?
3.3 LOCATING IMAGES IN A PLANE MIRROR
Inquiry:
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Part B - Drawing an Image
A
Object
B
To draw the image of the object (the pen), we have to draw the image points for the key points
in the original object. In this case, the two ends of the pen (points labeled A and B).
Using the same procedure you used to find the image of points on the previous activity, now find
the image of the two end points of the pen.
Be careful, you will need to draw a lot of lines!
Once you have found the two points, connect them and try to sketch the outline of the image
of the pen.
Label the image I.
Practice – Determine the image for each of the following objects. Label the images I1 and I2.
*** Think about how many key points you will need for each object.
S:
A:
L:
T:
Identify the salt for each image.
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S:
A:
L:
T:
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