1. A camera is equipped with a lens with a focal length of 25 cm. When an object 1.9 m (190 cm) away is being photographed, how far from the film should the lens be placed? ____________ cm

2. A camera is equipped with a lens with a focal length of 35 cm. When an object 2.1 m (210 cm) away is being photographed, what is the magnification?

3. The equation connecting s, p, and f for a simple lens can be employed for spherical mirrors, too. A concave mirror with a focal length of 9 cm forms an image of a small object placed

12 cm in front of the mirror. Where will this image be located? (For spherical mirrors, positive p means the image is on the same side of the mirror as the object.)

p = _______________ cm (please no hand writing solution for other wise down vote)