A convex lens of focal length $15 \mathrm{~cm}$ is placed in front of a plane mirror at a distance $25 \mathrm{~cm}$ from the mirror. Where on the optical axis and from the centre of the lens should a small object be placed such that the final image coincides with the object?

• Correct answer
  A

  $15 \mathrm{~cm}$ and on the opposite side of the mirror
• B

  $15 \mathrm{~cm}$ and between the mirror and the lens
• C

  $7.5 \mathrm{~cm}$ and on the opposite side of the mirror
• D

  $7.5 \mathrm{~cm}$ and between the mirror and the lens

Hence, the correct answer is option: 'A'.