Past exam of the physics course of the year 1 of the natural sciences course of the University of Cambridge / 2017 / Section A / 3

Use the thin lens equation with positive object and real-image distances $u,v$:The transverse magnification is $M=-v/u=-f/(u-f)=-4/296$. For an object dimension $500\mathrm{mm}$, the corresponding image dimension isThe minus sign of the magnification means that the image is inverted. This is the ideal thin-lens prediction; it assumes the relevant field is admitted by the camera and ignores lens distortion.