A80-cm-wide object seen through an optical device appears inverted and 50 cm wide. what is the magnification of the optical device? a. 1.3 b. 0.63 c. -0.63 d. 2.5 e. -1.3

The magnification is the ratio between the size of the image  and the size of the original object :

The sign of the magnification contains another piece of information: if it's positive, then the image is upright, if it's negative, the image is inverted. In our problem, the image is inverted, so the magnification will have a negative sign, and it will be

Ireally don’t know