What is the focal length of a converging lens with power +4 diopters? A 4 m B 0.25 m C 25 m D 0.04 m ✓ Correct Answer: Option B Power P = 1/f (in meters). f = 1/P = 1/4 = 0.25 m = 25 cm. Practice MCAT Exam Prep Quizzes → Browse All Questions Study Flashcards