An object is placed in front of a concave mirror at a point beyond its centre of curvature C. The image is formed at a point ______ and is ______.

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RRB Group D 8 Sept 2022 Shift 3 Official Paper
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  1. beyond C, diminished
  2. beyond C, enlarged
  3. between F and C, enlarged
  4. between F and C, diminished

Answer (Detailed Solution Below)

Option 4 : between F and C, diminished
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The correct answer is between F and C, diminishedKey Points 

  • An object is placed in front of a concave mirror at a point beyond its centre of curvature C, the image is formed at a point that is between the centre of curvature and the focus (C and F respectively), and is real, inverted and smaller than the object.
  • When an object is placed at a point beyond the centre of curvature of a concave mirror, the reflected rays converge at a point before the mirror, creating a real image that is inverted and smaller than the object. The image is also located between the centre of curvature and the focus of the mirror.
  • It's also worth noting that in this case, the image is also always virtual, since the image is formed "behind" the mirror, meaning that it cannot be projected on a screen.

Additional Information

  • When an object is placed at a point beyond the centre of curvature (C) of a concave mirror, the reflected rays converge at a point before the mirror, creating a real image that is inverted (upside-down) and smaller than the object. The image is also located between the centre of curvature and the focus (F) of the mirror.
  • Additionally, it is also worth noting that the distance of the object (u), the distance of the image (v), and the focal length (f) of the mirror are related by the mirror equation:
  • 1/f = 1/v - 1/u
  • Where, a negative value of v represents that the image is real, inverted and on the same side of the mirror as the object, and a positive value of v represents that the image is virtual, erect and on the opposite side of the mirror.
  • Also, The image is always diminished in size as the object is beyond the centre of curvature of the mirror, The image is also always virtual, since the image is formed "behind" the mirror, meaning that it cannot be projected on a screen.

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