An object is placed in front of a convex lens. A real inverted image of double its size is formed. When the object is moved closer to the lens by a distance $d$, the image shifts away from the lens by a distance $8 d$ from its previous position. What is the magnitude of the magnification in the final setup?

• A

  $16$
• B

  $1 / 2$
• Correct answer
  C

  $4$
• D

  $8$

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