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Topic Reflection of light
Asked 6 times across 3 UPSC exams over 31 years (1994–2025), peaking in 2020.
Key insights
- Most tested in NDA — 3 of 6 PYQs
- Most asked in 2020
- Recurs across 5 years (1994–2025)
How it travelled across exams
First appearance in each exam — the same idea, reframed.
CSE 1994 → CDS 2020 → NDA 2023
How the concept evolved
Rising — more than half its appearances (5 of 6) are since 2016.
Sample questions
You've seen the pattern — here are a few of the actual PYQs.
NDA2025
An object is placed between infinity and the pole (P) of a convex mirror. The position of the image is
- A between pole (P) and the focus (F), behind the mirror ✓
- B between the focus (F) and infinity, behind the mirror
- C between the pole (P) and the infinity, in front of the mirror
- D at the focus (F), behind the mirror
✓ Correct answer: (A)
Science & Technology › Physics & Chemistry
NDA2024
A point object is placed at the centre of curvature of a spherical concave mirror. Which one among the following would be the correct location of image formed ?
- A At infinity
- B At the centre of curvature ✓
- C At the focal point
- D Between the focal point and the centre of curvature
✓ Correct answer: (B)
Science & Technology › Physics & Chemistry
NDA2023
Sita, 1.5 m high, stands before a plane mirror fixed on a wall to view her full image. What should be the minimum height of the plane mirror so that Sita can view her image fully ?
- A 0.50 m
- B 0.35 m
- C 0.75 m ✓
- D 0.25 m
✓ Correct answer: (C)
Science & Technology › Physics & Chemistry
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