Answer :

Focal length of the mirror f =20 cm


hi/h0 = 1/3


if the mirror is a concave mirror, then the focal length of the mirror, f= -20 cm


Magnification is given by




Object distance u = -3v or v= - u/3


Applying the mirror formula






v = 40/3


So, the image is virtual, erect and diminished and the mirror is a concave mirror.


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