To get a virtual, erect and enlarged image behind a concave mirror, where should the object be placed?

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RRB JE CBT I - (Held On: 30 May 2019 Shift 2)
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  1. Between pole P and focus F
  2. At the centre of curvature C
  3. At focus F
  4. Between centre of curvature C and focus F

Answer (Detailed Solution Below)

Option 1 : Between pole P and focus F
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The correct answer is Option 1

Key Points

  • To get a virtual, erect, and enlarged image behind a concave mirror, the object should be placed between the pole (P) and focus (F) of the mirror.
  • When the object is placed in this position, the reflected rays diverge, and when extended backward, they appear to come from a point behind the mirror, forming a virtual image.
  • This image is upright and larger than the object.
  • This principle is used in applications like shaving mirrors and makeup mirrors, where a magnified reflection is desirable.

Additional Information

  • A concave mirror, also known as a converging mirror, has a reflecting surface that curves inward.
  • It can produce both real and virtual images depending on the position of the object relative to the mirror's focal point and center of curvature.
  • When the object is placed at different positions relative to the mirror, the nature, size, and orientation of the image change.

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