A slide projector gives a magnification of 10. If a slide of dimensions 3 cm x 2 cm is projected on the screen, the area of the image on the screen is:

Magnification=area of image / area of object

Area of image = Magnification×area of object

                     =10 (3 cm × 2 cm)

Area of the image will be:
3 x 10 cm x 2 x 10 cm = 600 cm²