NEET UG 2018 · Physics · Question 20
NEET 2018 Physics, question 20
Question 20 of the NEET 2018 paper (code AA) is a Physics question from Ray Optics and Optical Instruments. Its idea, Mirror Formula Application, was asked only this once in NEET 2017–2026. The CBSE official answer key gives option 2.
Updated 2026-10-08
Q20 · Physics
An object is placed at a distance of 40 cm from a concave mirror of focal length 15 cm. If the object is displaced through a distance of 20 cm towards the mirror, the displacement of the image will be
- 130 cm towards the mirror
- 236 cm away from the mirrorOfficial answer
- 330 cm away from the mirror
- 436 cm towards the mirror
Official answer: option 2 · CBSE official answer key
Same idea
The only question on Mirror Formula Application
No other NEET paper from 2017–2026 tested this exact idea.
Mirror 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. Spherical Mirrors alone had 1.