If the image formed is always virtual, the mirror can be:(a) concave or convex (b) concave or plane (c) convex or plane (d) only convex
(c) convex or plane
Explanation
Both convex and plane mirror always form virtual images.
A convex mirror always forms virtual, erect, and diminished images irrespective of the distance between the object and the mirror.
Also, the image formed by a plane mirror is always virtual, erect (upright), of the same size as the object, at the same distance behind the mirror, and laterally inverted.
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