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State PCS PYQPrelims 2023

BPSC – Combined Competitive Examination · Question 15

The image formed by a concave mirror is real, inverted and of the same size as the object. The position of the object should be:

  1. at the focus
  2. at the centre of curvature
  3. between the focus and centre of curvature
  4. beyond the centre of curvature
Show answer & explanation

Answer: (B) at the centre of curvature

Explanation

For a concave mirror, an object at C (2f) forms a real, inverted, same-size image at C.

  • (A) Incorrect

    Wrong: image forms at infinity.

  • (B) Correct

    Correct: object at C gives a same-size, real, inverted image at C.

  • (C) Incorrect

    Wrong: image is enlarged beyond C.

  • (D) Incorrect

    Wrong: image is diminished between F and C.