h1 = 3 cm, u = – 14 cm, f = –21 cm. v = ?
1/v - 1/u = 1/f, 1/v = 1/u + 1/f = 1/-21 + 1/-14 = (-2 - 3)/42 = -5/42
∴ v = -42/5 = - 8.4cm So, image is errect and virtual; m = h'/h = v/u
∴ h' = v/u x h = -8.4/-14 x 3 = 1.8cm.
When the object is moved further away from the lens (u → ∞), the image moves towards the focus of lens (v → f) but never beyond f.