NEET UG 2021 · Physics · Question 17
NEET 2021 Physics, question 17
Question 17 of the NEET 2021 paper (code O1) is a Physics question from Ray Optics and Optical Instruments. Its idea, Combination of Lenses Separated by a Distance, was asked twice, in 2021 and 2026, across NEET 2017–2026. The NTA final answer key gives option 4.
Updated 2026-10-08
Q17 · Physics
A convex lens 'A' of focal length 20 cm and a concave lens 'B' of focal length 5 cm are kept along the same axis with a distance 'd' between them. If a parallel beam of light falling on 'A' leaves 'B' as a parallel beam, then the distance 'd' in cm will be :
- 150
- 230
- 325
- 415Official answer
Official answer: option 4 · NTA final answer key
Same idea
Combination of Lenses Separated by a Distance, in other papers
NEET asked this idea twice, in 2021 and 2026. The other question below.
- 2026 Q29The lens combination as shown in the figure, consists of two lenses, and , of the focal lengths +10 cm and cm,…Figure-based · Medium
Combination of Lenses Separated by a Distance: every question and how it was framed
The chapter
Ray Optics and Optical Instruments in ten years of NEET
26 questions from 2017–2026, asked in 10 of 10 papers, about 2.5 a paper. Thin Lens Formula alone had 9.