Question

formation of virtual image is possible in :
A.Plane mirror
B.concave mirror
C.convex mirror
D.all of the above

Answer 1

Its plane mirror.

But if you tell in depth you will get a virtual and erect imange in concave mirror if the object is placed between pole and principal focus.

And always you will get a virtal and erect image in a convex mirror

Answer 2

all of the above
more over the options yu have given are incorrect