To determine the correct mirror image of the given figure when the mirror is placed at line MN, we must understand the concepts of reflection in a mirror. When an object is reflected in a mirror, its image is reversed from left to right.

Let's apply this concept to the given figure:

1. The position near line MN will be reflected first, so the last character near MN will appear at the start of the mirror image.
2. The sequence of characters must be reversed, and characters that are horizontally symmetrical will appear the same, while asymmetrical characters will appear as their reversed versions.

Applying these steps to the given figure, each character will appear reversed around the MN line:

• 'P' will appear as mirrored, which usually looks like a backward 'P'.
• 'F', 'G', '3', '5' will appear flipped due to their asymmetry.

Let's examine the options to find the correctly reversed mirror image.

1. Scan each option for reversed positions of the characters.
2. Compare each position to ensure accurate mirror reflections.

The correct mirror image is reflected accurately in the following option:

The above option is the accurate mirror image, adhering to the rules of reflection.

Conclusion: The correct mirror image of the given figure with the mirror at MN is represented by the option shown above.