# <span lang="EN-US

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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