This is a sum-up of how to do so:
1)Locate the image point. One of the image property of a plane mirror is that the distance between the image and the mirror is equal to the distance between the object and the mirror. Therefore, we would be able to locate the image point.
2)Draw a light ray from the eye to the image. When we look into a mirror, we would see the image. Therefore, we can draw a straight line from our eye to the image point.(Use dotted lines behind the mirror)
3)Draw a line from the object to the mirror point where the light ray had intercepted.
This is a simple way of constructing a ray diagram.
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