NEET UG 2021 · Physics · Question 50
NEET 2021 Physics, question 50
Question 50 of the NEET 2021 paper (code O1) is a Physics question from Ray Optics and Optical Instruments. Its idea, Thin Lens Formula Application, was asked only this once in NEET 2017–2026. The NTA final answer key gives option 2.
Updated 2026-10-08
Q50 · Physics
A point object is placed at a distance of 60 cm from a convex lens of focal length 30 cm. If a plane mirror were put perpendicular to the principal axis of the lens and at a distance of 40 cm from it, the final image would be formed at a distance of :
The figure, described in words
Stem: ray figure of a convex lens and plane mirror perpendicular to the axis with distances 60 cm and 40 cm marked.
- 130 cm from the plane mirror, it would be a virtual image.
- 220 cm from the plane mirror, it would be a virtual image.Official answer
- 320 cm from the lens, it would be a real image.
- 430 cm from the lens, it would be a real image.
Official answer: option 2 · NTA final answer key
Same idea
The only question on Thin Lens Formula Application
No other NEET paper from 2017–2026 tested this exact idea.
Thin Lens Formula Application: 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.