If the image formed by a thin convex lens of power $P$ has agnification m then image distance $v$ is

• Correct answer
  A

  $v=\frac{1-\mathrm{m}}{\mathrm{P}}$
• B

  $v=\frac{1+m}{P}$
• C

  $v=\frac{m}{P}$
• D

  $v=\frac{1+2 m}{P}$

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