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Q21 (CDS-I/2025) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Geometrical optics Answer Verified

If your image appears to be erect, no matter how far you stand from a mirror, the mirror is likely to be :

Result
Your answer: —  Â·  Correct: D
Explanation

A mirror that consistently forms an erect image regardless of the object's distance can be either a plane mirror or a convex mirror. A plane mirror always forms a virtual, erect image of the same size as the object [4]. Similarly, a convex mirror always produces a virtual, erect, and diminished image, no matter where the object is placed relative to the mirror [3]. In contrast, a concave mirror only forms an erect image when the object is placed very close to it, specifically between the pole and the focal point [3]. If the object is moved further away from a concave mirror (beyond the focal point), the image becomes real and inverted [3]. Therefore, if the image remains erect at all distances, the mirror is likely either plane or convex.

Sources

  1. [1] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 10: Light: Mirrors and Lenses > Activity 10.3: Let us explore > p. 156
  2. [4] Science-Class VII . NCERT(Revised ed 2025) > Chapter 11: Light: Shadows and Reflections > Activity 11.7: Let us experiment > p. 161
  3. [2] Science , class X (NCERT 2025 ed.) > Chapter 9: Light – Reflection and Refraction > Activity 9.5 > p. 141
  4. [3] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 10: Light: Mirrors and Lenses > Snapshots > p. 165
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