Where can an observer see a reflected image?
If in an exam you were asked to find the area where an observer can see the image in a mirror, you would do so as follows:
You need to apply the laws of reflection and initially draw an image on the other side of the mirror perpendicular (at 90°) to the mirror.
Behind the mirror
We end up with a diagram as follows:
The second stage is to draw rays from the object to the edges of the mirror and reflect off the edges, either
- So that the angle of incidence equals the angle of reflection
- Draw from the image to the points on the edges
Between these two reflected lines any observer will be able to see a reflected image.