Given,
Object height (O) = 5 cm
focal length (f) = 10 cm (negative)
Object distance (u) = 60 cm (negative)
1\over u + 1\over v = 1\over f
⇒ – 1\over 60 + 1\over v = – 1\over 10
⇒ 1\over v = – 1\over 10 + 1\over 60
⇒ 1\over v = - 6 + 1\over 60 = – 5\over 60 = – 1\over 12
⇒ v = -12 cm
The image distance (v) = 12 cm infront of the mirror.
⇒ I\over 5=-12\over 60
⇒ I = –12\over 60 × 5 = – 1 cm
Hence, length of image = 1 cm
Negative sign shows that the image will be inverted.