How to distinguish between real and fake mirrors Motel

(1)The left side is a double mirror and the right side is a real mirror
(2)Put your finger on the surface of the mirror, and if you’re looking at a picture
(3)To the right

(1)If there’s a gap between your finger and the reflection, it’s a real mirror
(2)If your finger is a reflection of the picture on the left, it’s a straight line
(3)Be careful if you can feel it
(4)It’s a mirror that you can see inside a double mirror