Description:An incandescent bulb with printing on the top is used as an object to be imaged with lenses of different focal lengths.
Hold the lens above the light bulb at a distance slightly greater than the focal length of the lens to cast an image of the trademark onto the ceiling. Change lenses to change the magnification. (10cm and 20cm focal length lenses tend to work best in most rooms, but 5cm, 30cm, and possibly others can also be available upon request.)