Lens Combinations Power & Prisms — Practice Questions

Free NEET Physics multiple-choice questions on Lens Combinations Power & Prisms. Attempt each question and reveal the answer with a full explanation.

Two lenses of power +2.50 D and -3.75 D are combined. The focal length of the combination is: -80 cm 80 cm -40 cm 40 cm Two thin lenses of power +12 D and -2 D are placed in contact. What is the focal length of the combination? 10 cm 12.5 cm 16.6 cm 8.33 cm A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length 40 cm . The power of the combination is: +2.5 D -2.5 D +5.0 D -5.0 D The lens combination as shown in the figure, consists of two lenses, L 1 and L 2 , of the focal lengths +10 cm and -10 cm, respectively. The position of the image formed is: 20 cm to the left of the concave lens 60 cm to the left of the concave lens 30 cm to the right of the concave lens 60 cm to the right of the concave lens