if a candle is placed in front of a piece of clear glass and you look at its reflection from an angle there r2

Question

when you look at the reflection of the candle from directly over the flame you see one image but when the viewing angle is shifted a double image is seen. Why?

Answer 1

You get a reflection from both the front and back surfaces of the glass at the change of the index of refraction at the air/glass surface. Normally the back one is considerably dimmer due to passing through the glass twice.