Select the correct mirror image of the given figure when the mirror is placed at MN as shown below.

Correct — B. A mirror standing at the vertical line MN does two things at once.

Rule: the characters reverse order left to right, and each glyph is itself turned back-to-front.

The strip reads y T f r 9 3 n, so the image must run n 3 9 r f T y.
Then every character turns: the 3 and the 9 face the other way, the r points left, and the arm of the f points left.
The T is unchanged, because a capital T is symmetrical about its own vertical axis.

Only one strip satisfies both halves of the rule — option (b)

Why the others are wrong

• (a)
  This strip turns two glyphs top to bottom instead: the T is printed upside down, its bar at the foot, and the f is turned over the same way. A vertical mirror flips glyphs left to right only, so a capital T comes through unchanged.
• (c)
  Here the digits have not been mirrored at all — they read as an ordinary 9 followed by an ordinary 3, in the question's own order. A vertical mirror reverses digits exactly as it reverses letters.
• (d)
  Here the r still points to the right, exactly as it does in the question. Every glyph must turn, not merely most of them.

A mirror placed at a vertical line performs a left-right reflection, and students lose the mark by doing only half of it.

Half one: the reading order reverses, so the last character of the strip becomes the first of the image.

Half two: each individual glyph is flipped about its own vertical axis. Digits flip too — a mirrored 3 and a mirrored 9 do not read as 3 and 9.

Key facts

• A vertical mirror reverses the order of the characters and flips each character left to right.
• Capitals symmetrical about a vertical axis — A, H, I, M, O, T, U, V, W, X, Y — look unchanged in a vertical mirror.
• Lowercase letters such as r, f, n and y are not symmetrical, so each of them visibly changes.
• A water image is the horizontal-mirror version, and it turns glyphs upside down instead.

Common traps

• Picking the water image, in which glyphs are turned upside down rather than back to front
• Reversing the order but leaving the digits facing their original way
• Assuming the whole strip is symmetrical because one character, the T, is

No directly related past PYQ was found.