1. See the diagram below.
2. The ray of light from the candle is reflected at the mirror, and bounces off at the same angle as it come to the mirror.
3. Our eye does not know that the light has been reflected.
4. Our eye sees the object (the candle) in the mirror, and feels that light is coming from that candle which seems to be behind the mirror.
5. In this way we see an image of the candle
