Question
An object is placed between infinity and the pole (P) of a convex mirror. The position of the image is
NDA
General Ability
General Science
2025
NDA 2025 (Phase 1)
NDA General Ability Question (2025) — Solution
Options
- 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
Answer
A. between pole (P) and the focus (F), behind the mirror
Step-by-step solution
Using the mirror formula: 1 v + 1 u = 1 f 1 v = 1 f - 1 u For a convex mirror, the focal length f is positive (f > 0). The object is placed in front of the mirror, so the object distance u is negative (u Since f > 0 and u 1 f . This implies that v 0, we have v > 0. Thus, 0 Answer: between pole (P) and the focus (F), behind the mirror
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