Question:How to we work out what happens if there are more than one mirrored surface or reflective boundary?
Using the law of reflection and putting in a new normal line at each point of reflection it is quite easy to work out where a ray of light will go.
Remember that the rays of light are always directed from the light source to the object being viewed and from the object being viewed towards the eye; or you would see nothing.
Rays must always be straight lines with an arrow half way along indicating the direction of the light.
One of the rays has the arrow head missing; so it is incorrectly drawn!