Final answer:
The nature of the image formed by a mirror can reveal whether it is plane, concave, or convex.
Explanation:
To determine whether a mirror is plane, concave, or convex without touching it, one can analyze the nature of the image formed by the mirror. For a convex mirror, the image is always virtual, appearing smaller and behind the mirror. On the other hand, a concave mirror can form real or virtual images depending on the object's position relative to the focal point.
Learn more about Types of mirrors and images formed here:
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