NEET 2023 Phase 2 · PhysicsPrevious Year Question
A lens is made up of 3 different transparent media as shown in the figure. A point object O is placed on its axis beyond 2f. How many real images will be obtained on the other side?
Answer: (B) 3. Answer: (B) 3 Solution: The lens is composed of 3 regions of different refractive indices, so it effectively acts as three lenses each with a different focal length, all sharing the same optic axis.
- A.No image will be formed
- B.3✓
- C.2
- D.1
Correct Answer
(B) 3
Solution & Explanation
Answer: (B) 3 Solution: The lens is composed of 3 regions of different refractive indices, so it effectively acts as three lenses each with a different focal length, all sharing the same optic axis. For an object placed beyond 2f, each region forms its own real image (object distance is large enough that each region gives a real image). Three distinct focal lengths → three distinct real image positions on the other side. Hence 3 real images are obtained.
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