Q1. [1] § 9.1 REFLECTION OF LIGHT § 9.2.1 Image Formation by Spherical Mirrors § 9.2.3 Sign Convention for Reflection by Spherical Mirrors
Mirror 'X' is used to concentrate sunlight in solar furnace and Mirror 'Y' is fitted on the side of the vehicle to see the traffic behind the driver. Which of the following statements are true for the two mirrors ?
(i) The image formed by mirror 'X' is real, diminished and at its focus.
(ii) The image formed by mirror 'Y' is virtual, diminished and erect.
(iii) The image formed by mirror 'X' is virtual, diminished and erect.
(iv) The image formed by mirror 'Y' is real, diminished and at its focus.
- (A) (i) and (ii)
- (B) (ii) and (iii)
- (C) (iii) and (iv)
- (D) (i) and (iv)
Previously asked in CBSE board exam
2025 31/1/1 Q13
Generated by claude-sonnet-4-6 · 2026-06-15 06:48 · grounding rag
Model Answer
(A) (i) and (ii)
Mirror X is a concave mirror (used in solar furnace); it forms a real, diminished image at its focus when the object is at infinity. Mirror Y is a convex mirror (rear-view mirror); it always forms a virtual, erect and diminished image.
Explanation
- Mirror X = Concave mirror: Sunlight comes from infinity, so image forms at focus F — real, inverted, and highly diminished (point-sized). Statement (i) is correct.
- Mirror Y = Convex mirror: Always produces a virtual, erect, and diminished image regardless of object distance. Statement (ii) is correct.
- Statements (iii) and (iv) swap the properties incorrectly between the two mirrors.
- Key recall: Table 9.1 confirms concave mirror image at infinity → focus, real & diminished; convex mirror always gives virtual, erect, diminished image.
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