In which type of mirror does an object's tip appear to touch its image when in contact with the glass?

In a front surface mirror, the reflective coating is applied directly to the surface of the glass, minimizing any distortion or delay caused by the thickness of the glass itself. This design allows for an accurate reflection where the object’s tip will appear to almost touch its image when it contacts the glass. This phenomenon occurs because the light reflecting from the object travels directly to the surface and back without passing through the material of the glass, thus providing a true one-to-one reflection at the interface.

In contrast, concave and convex mirrors have specific curvatures that alter the way images are formed. A concave mirror can create magnified images but does not facilitate the same one-to-one contact effect. A convex mirror, on the other hand, produces diminished, virtual images that appear behind the mirror surface, which would prevent the object from appearing to touch its reflection. A plane mirror, while also creating a true reflection where the image is identical in size and orientation, does not exhibit the same direct contact experience as a front surface mirror does, since the image will be slightly behind the glass surface due to its thickness.