The Lens of a Slide Projector Has a Focal Length

Multiple Choice

The lens of a slide projector has a focal length of +12.0 cm.A slide 12.6 cm to the left of the lens forms the object for the lens.The screen should be placed

A) 25 cm to the left of the lens.
B) 25 cm to the right of the lens.
C) 250 cm to the left of the lens.
D) 250 cm to the right of the lens.
E) 390 cm to the right of the lens.